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Source: — Problem Solving |
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by cramya » Mon Feb 23, 2009 12:14 am
Prime factorize and then add 1 to the exponents of the various distinct factors and multiply

36*36 = 1296

1296 = 2^4 * 3^4

(4+1) * (4+1) = 25

Hope this helps!

Regards,
CR
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by sureshbala » Mon Feb 23, 2009 1:46 am
Since the given number is a perfect square, total number of its factors must be odd. Only one option 25.

Hey...am I trying to be too quick
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by joyseychow » Mon Feb 23, 2009 5:17 am
Thanks CR!!

Sureshbala.. that's a sure quickie! It does make sense.
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by welcome » Mon Feb 23, 2009 12:35 pm
sureshbala, Good catch.
Shubham.
590 >> 630 >> 640 >> 610 >> 600 >> 640 >> 590 >> 640 >> 590 >> 590
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