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 - 10 years agoHelpfull: Yes(12) No(1)
- n=11111111
- 10 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.
- 10 years agoHelpfull: Yes(1) No(0)
- use calc dumbo :P
- 10 years agoHelpfull: Yes(0) No(3)
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