Summing Binomial Coefficients (Exam Question)

[TheJProductins]

That's a beautifully constructed question. That first choice would really trip up students.

[ee-zmhz]

This was extremely helpful, thank you very much:)

[jordananastasiou]

The people speaking in the background are extremely annoying.

[ritikkhatri]

very easy, we know by the property that sum of all binomial coefficients in 2^n, now we subtract 1 casue we have the first tern nC0 missing, hence ans is: 2^n-1

[Minez]

Evaluate the sum of all the coefficients in the expansion of (1+x)^k from k=1 to k=n