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## Homework Statement

Find the number of ways in which an odd number of objects can be chosen from n objects.

## The Attempt at a Solution

We have 2 cases-

1) n is even

nC1 + nC3 + nC5 + ... nCn-1

2) n is odd

nC1 + nC3 + nC5 + ... nCn

I think adding them will give the answer.

How do I find out the sum?