CAT Exam Numerical Ability Age Problem

If n^2=123456787654321, what is n?

Read Solution (Total 4)

11*11=121
111*111=12321
1111*1111=1234321
11111*11111=123454321
111111*111111=12345654321
1111111*1111111=1234567654321
11111111*11111111=123456787654321
11 years agoHelpfull: Yes(12) No(1)

n=11111111
11 years agoHelpfull: Yes(1) No(0)
simply: For 11^2=121
1111^2=1234 321 (no. of 11s=4)
Again, 111111^2=123456 5432 (no. of 11s=6)
from above we can see that for number of 11s the series goes sequentially after that it breaks.
so for 12345678 7654321 will be = 8 no. of 11s
i.e 11111111.
11 years agoHelpfull: Yes(1) No(0)
use calc dumbo :P
11 years agoHelpfull: Yes(0) No(3)

CAT Other Question

Meera was studying for her examinations and the lights went off. It was around 2:00 AM. She lighted two uniform candles of equal length but one thicker than the other. The thick candle is supposed to last six hours and the thin one three hours. When she finally went to sleep, the thick candle was twice as long as the thin one. For how long did Meera study in candle light? If x^2+y^2=0.1 and |x-y|=0.2, then |x|+|y| is equal to?