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# CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)

## CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)

Discuss CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) within the Quant forums, part of the CAT, XAT, MAT, CET, JMET and other Indian MBA Entrance Exams category; Originally Posted by gaurav200x how can i be wrong in the 1st one... the last digits have to be 72 ...

 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)
Rahul Parab

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Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 23rd, 2006

Quote:
 Originally Posted by gaurav200x how can i be wrong in the 1st one... the last digits have to be 72 to be divisible by 3. 32, 52 or 92 can't be and for the last one... I too thought about I and III but i dun think I is completely true... bcoz 1 is not included.
__________________________________________________ _______________

LET ME ANSWER FOR Q. 1) -

The given number should be divisible by both 9 & 4
Thus, as per the rule ,
I] DIVISIBILITY TEST FOR 4 -
A number is divisible by 4 when the number formed by the last two rigjht hand digits is divisible by 4 or if the last two digits are 0's.

II] DIVISIBILTY TEST FOR 9 -
A number is divisible by 9 when the sum of its digits is divisible by 9.

Therefore, 3+0+5+1+4+3+2+A = 18+A

If we take 9 (Option 4), then sum of digits (i.e. 27/9 = 3) is divisible by 9
[as per II] &
last two right hand digits (i.e. 92/4 = 23) is divisible by 4 [as per I].

Hence, answer is 4] 9. .

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 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)
 (22 (permalink)) gaurav200x   Student of Bachelor of Engineering Noida, Uttar Pradesh Status: Offline Posts: 3,821 Join Date: Feb 2006 Location: Noida, Uttar Pradesh Age: 31 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 23rd, 2006 Thanks Rahul, i did give it a deeper thought later on, and realised the mistake but since there was no power, i couldn't come online. Regards, Gaurav Mittal [I][B]Problems in Life? -[/B][/I] [I][B]Visit Uncle Sam's Den[/B][/I][I][B] !! [/B][/I][I][B] [/B][/I][U][B]200+ Mb CAT Material[/B][/U] Would u like to see [I][B]Gaurav Ki Duniya[/B][/I] [I][B]Blog Updated[/B][B] !!! [/B][/I][I][B] [/B][/I][I][B]How to Use MP & Simple Rules at MP[/B][/I] [I]ONLINE GD[/I][B] - [/B]Schedule FAQs GD Proceeding Concept of Online GD [I][B]Join [/B][/I][I][B]to get GD notifications, updates[/B][/I][I][B] http://groups.yahoo.com/group/onlinegd [/B][/I] [B][I]Liked my post? Press the[/I][/B][B][I]button[/I][/B] Friends: (5)
 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)
 (23 (permalink)) neeraj_uchila   Status: Offline Posts: 43 Join Date: Jun 2006 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 23rd, 2006 If a and b are two prime nos it can take the values 78 as it is the addition of two prime nos 61,17i.e 61+17=78 Similarly 7 can be expressed as the addition of 2 and 5 The last no 23 cannot be expressed as the addition of any two prime nos. So the correct option is 3 i.e 1 and 2 only Friends: (0)
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 (25 (permalink)) neeraj_uchila   Status: Offline Posts: 43 Join Date: Jun 2006 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 24th, 2006 The ans to question no 3 is d)none of these as 9+49=58 which ends in 8 and 81+1=82 which ends in 2 so 1 statement in not true Similarly 1+8=9 which is the sumof the cubes of 1 and 2 ends in 9 ans 216+27 which is the sum of cubes of 6 and 3 ends in 9 also the sum of 100+1000 ends in 0 so the third statement is false Friends: (0)
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 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)
 (26 (permalink)) neeraj_uchila   Status: Offline Posts: 43 Join Date: Jun 2006 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 24th, 2006 The ans to the 4 problem is option 2)I, II, IV, V. 847+53=900 which is the square of 30. 847*7=5929 which is the sqaure of 77. 847/11=77 which is not a perfect square. 847/7=121 which is the square of 11. 847-6=841 which is the square of 29 PSlz give the ans for the first 2 questions Friends: (0)
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 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)
Rahul Parab

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Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 24th, 2006

Quote:
 Originally Posted by neeraj_uchila The ans to question no 3 is d)none of these as 9+49=58 which ends in 8 and 81+1=82 which ends in 2 so 1 statement in not true Similarly 1+8=9 which is the sumof the cubes of 1 and 2 ends in 9 ans 216+27 which is the sum of cubes of 6 and 3 ends in 9 also the sum of 100+1000 ends in 0 so the third statement is false
good, neeraj , answer for Q. 3 is correct...
good going...

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 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)
Rahul Parab

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Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 24th, 2006

Quote:
 Originally Posted by neeraj_uchila The ans to the 4 problem is option 2)I, II, IV, V. 847+53=900 which is the square of 30. 847*7=5929 which is the sqaure of 77. 847/11=77 which is not a perfect square. 847/7=121 which is the square of 11. 847-6=841 which is the square of 29 PSlz give the ans for the first 2 questions
i'm not sure abt this question...
let gaurav give answers...for 1 & 2...

these r so simple yaar... try again !

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 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)
 (29 (permalink)) neeraj_uchila   Status: Offline Posts: 43 Join Date: Jun 2006 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 24th, 2006 sorry man i did not read the note for the 1st 2 questions. The ans for the 1 st question is 3] I, III and V only. For the 2 nd question I am getting the 1) and2)statement as always true Friends: (0)
 Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)
Rahul Parab

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Re: CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING) - August 24th, 2006

Quote:
 Originally Posted by neeraj_uchila sorry man i did not read the note for the 1st 2 questions. The ans for the 1 st question is 3] I, III and V only. For the 2 nd question I am getting the 1) and2)statement as always true
u r correct for Q. 1, neeraj

try again Q. 2,plz...cheer up!

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