If n is an even number, all of the following must also be even except

Step-by-step explanation:

Given

Required

Which cannot be even

To do this, we assume an even number for n;

Assume that

So, we have:

--- this is odd

---- this is even

--- this is even

--- this is even

Hence, (a) can't be even

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step-by-step explanation:

could you provide figure.