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If `n_1, n_2, n_3 ,……., n_k` are such that, out of these k elements `k/2` elements are even and rest are odd numbers. Which is necessarily even?

A

`(n_1+2n_2+3n_3+4n_4+…+k.n_k)`

B

`n_1.n_2.n_3…n_(k/2+1)`

C

`(n_1+n_3+n_5+n_7+…+n_(k-1)`

D

`n_2+n_4+n_6+…+n_k`

Text Solution

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The correct Answer is:
B
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