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algebric expression, how to proceed

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by sam2304 » Wed Jan 04, 2012 2:24 am
a, b, c & d are 4 real nos which are positive and not distinct. All can take the same minimum value and their product is 1.

a*b*c*d = 1 and a=b=c=d.

(1+a)(1+b)(1+c)(1+d) = (1+a)^4.

So ans choice must be a perfect number which satisfies the 4th power.

IMO C.

Hope its right.
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