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Re: divisibility - good one [#permalink]
10 Aug 2009, 10:06
1) X = k*(m^3 -m) = K*m*(m-1)*(m+1) Give K and m are > 9 X is definitely divisible by 2,3 but not by 5. 2)X = n^5 - n = n*(n^4 - 1) = n*(n^2 + 1)(n-1)(n + 1) given n > 9 So for any value of n the value is divisible by 2,3,5. Answer is B