Official Quant thread for CAT 2013

MBA CAT 2024
13383
@vbhvgupta said:
Yar what is the concept behind it....like for some other no's also do we have to divide those no by 25 to get the last 2 digit no????
No actually the last two digits are calculated when remainder with 100 is taken
what is 100?
100 = 4*25
since the above term is already divisible by 4, we can directly take the remainder by 25 because when you apply chinese remainder theorem, it boils down to the same


13384
@vbhvgupta said:
Yar what is the concept behind it....like for some other no's also do we have to divide those no by 25 to get the last 2 digit no????
Last two digits => Remainder by 100.

100 = 4*25
Check for 25 as here 4 wasn't needed.
13385
@vbhvgupta said:
(201* 202 * 203* 204* 246 * 247 * 248 * 249)^2 Last 2 digits????
76
13386
@vbhvgupta said:
Yar what is the concept behind it....like for some other no's also do we have to divide those no by 25 to get the last 2 digit no????
find last digit ==> div by 10 then remainder is ur last digit
find last two digits==> div by 100 then remainder is ur last two digits simlrly by 1000 and so on..
13387

Never Knew 76^2 = xx76.. 😃

13388
@pyashraj said:
Never Knew 76^2 = xx76..
Any power of 76 ends in 76.

Even Powers of 24 end in 76.
Odd Powers of 24 end in 24.
13389
@pyashraj said:
Never Knew 76^2 = xx76..
all even powers of 76 end in 76 while all odd powers of 24 end in 24
also, 24^even ends in 76....

this might help when last 2 digits of a number are asked, if asked i must say :)
13390
@Estallar12 saar..the journey begins..
13391
@mailtoankit said:
@Estallar12 saar..the journey begins..
Yeah. 😁 Lets keep Rolling and avoid Trolling. :P
13392

What is the least natural number that should be added to 576 to make it a perfect square?

13393
@Logrhythm said:
What is the least natural number that should be added to 576 to make it a perfect square?
49 😛 trap kindaa question
13394
@Logrhythm said:
What is the least natural number that should be added to 576 to make it a perfect square?
it is Already a perfect sq??
13395
@Logrhythm said:
What is the least natural number that should be added to 576 to make it a perfect square?
Lol. What is this ? :splat:
24, 25 and 7 is a Pytho Triplet.
=> 576 + 7^2 gives a PS. So, 49. :|
13396
@Logrhythm said:
What is the least natural number that should be added to 576 to make it a perfect square?
625(25^2)-576(24^2)=49
13397
@Logrhythm

Am i seeing it correctly..phir bhi.. 49 should be..
13398
@vbhvgupta said:
it is Already a perfect sq??
Yeah. So, go for the next one I guess. :splat:
13399
@vbhvgupta said:
it is Already a perfect sq??
576 is a perfect square..but u need to add a natural number to make it another perfect square which is 49
13400
@ravi.theja said:
49 trap kindaa question
@vbhvgupta said:
it is Already a perfect sq??
@Estallar12 said:
Lol. What is this ? 576 + 7^2 gives a PS. So, 49.


Ye it is 49

@Estallar12 it is a question from last year's aimcat.....just posted it to make all of us remember that even easy question appear in the exam, it is now always about the tough questions.. :)
13401
@Logrhythm said:
Ye it is 49@Estallar12 it is a question from last year's aimcat.....just posted it to make all of us remember that even easy question appear in the exam, it is now always about the tough questions..
Oh. :woot:
Thanks! :)

Easy questions should be sandwitched anyway. Good.!
13402

1st aimcat..i remember..