For positive integer k, is the expression \((k + 2)(k^2 + 4k + 3)\) divisible by 4?
(1) k is divisible by 8.
(2) (k + 1)/3 is an odd integer.
(k+2) = even = 2(m+1) where m is devisible by 4..........a
(k^2 + 4k + 3) = even + even+ odd = odd..........b
thus from a & b
th expression boils down to
2*odd*odd thus we can deduct that k is not devisible by 4........ie: 1 is suff
k+1 = odd and thus k is even could be ( check k = 0,2,4) we get multiple answers thus my answer is A