CRACK THE CAT - DOUBT OVER MATHS (PROBLEM SOLVING)

Go to Page...

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 ...

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].

1.READ RULES CAREFULLY BEFORE POSTING. REFER FAQS.
2.USE SEARCH OPTIONS.DO NOT ASK TO MAIL PROJECTS. GIVE IN DEPTH ANALYSIS ABOUT RESEARCH DONE BY YOU BEFORE ASKING FOR REFERENCE PROJECTS.
3.DO NOT POST YOUR MAIL IDS.
4.CLICK ON THANKS BUTTON TO THANK A PERSON.
5.DO NOT POST REGARDING HOW INFORMATIVE/HELPFUL A THREAD WAS, RATE IT.
6.POST IN CORRECT SECTIONS.DO NOT SPAM.

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

1.READ RULES CAREFULLY BEFORE POSTING. REFER FAQS.
2.USE SEARCH OPTIONS.DO NOT ASK TO MAIL PROJECTS. GIVE IN DEPTH ANALYSIS ABOUT RESEARCH DONE BY YOU BEFORE ASKING FOR REFERENCE PROJECTS.
3.DO NOT POST YOUR MAIL IDS.
4.CLICK ON THANKS BUTTON TO THANK A PERSON.
5.DO NOT POST REGARDING HOW INFORMATIVE/HELPFUL A THREAD WAS, RATE IT.
6.POST IN CORRECT SECTIONS.DO NOT SPAM.

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

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

Rahul Parab Financial Analyst at CMC Ltd Mumbai, India | Accounting

View Profile

Financial Analyst at CMC Ltd

Status: Offline

Posts: 5,198

Join Date: Apr 2006

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...

1.READ RULES CAREFULLY BEFORE POSTING. REFER FAQS.
2.USE SEARCH OPTIONS.DO NOT ASK TO MAIL PROJECTS. GIVE IN DEPTH ANALYSIS ABOUT RESEARCH DONE BY YOU BEFORE ASKING FOR REFERENCE PROJECTS.
3.DO NOT POST YOUR MAIL IDS.
4.CLICK ON THANKS BUTTON TO THANK A PERSON.
5.DO NOT POST REGARDING HOW INFORMATIVE/HELPFUL A THREAD WAS, RATE IT.
6.POST IN CORRECT SECTIONS.DO NOT SPAM.

Rahul Parab Financial Analyst at CMC Ltd Mumbai, India | Accounting

View Profile

Financial Analyst at CMC Ltd

Status: Offline

Posts: 5,198

Join Date: Apr 2006

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

Thanx, neeraj. Good answer.
i'm not sure abt this question...
let gaurav give answers...for 1 & 2...

1.READ RULES CAREFULLY BEFORE POSTING. REFER FAQS.
2.USE SEARCH OPTIONS.DO NOT ASK TO MAIL PROJECTS. GIVE IN DEPTH ANALYSIS ABOUT RESEARCH DONE BY YOU BEFORE ASKING FOR REFERENCE PROJECTS.
3.DO NOT POST YOUR MAIL IDS.
4.CLICK ON THANKS BUTTON TO THANK A PERSON.
5.DO NOT POST REGARDING HOW INFORMATIVE/HELPFUL A THREAD WAS, RATE IT.
6.POST IN CORRECT SECTIONS.DO NOT SPAM.

1.READ RULES CAREFULLY BEFORE POSTING. REFER FAQS.
2.USE SEARCH OPTIONS.DO NOT ASK TO MAIL PROJECTS. GIVE IN DEPTH ANALYSIS ABOUT RESEARCH DONE BY YOU BEFORE ASKING FOR REFERENCE PROJECTS.
3.DO NOT POST YOUR MAIL IDS.
4.CLICK ON THANKS BUTTON TO THANK A PERSON.
5.DO NOT POST REGARDING HOW INFORMATIVE/HELPFUL A THREAD WAS, RATE IT.
6.POST IN CORRECT SECTIONS.DO NOT SPAM.

ManagementParadise.com is not responsible for the views and opinion of the posters. The posters and only posters shall be liable for any copyright infringement.