The question is as followed:(adsbygoogle = window.adsbygoogle || []).push({});

In how many ways can a student answer a true-false test that has six questions?

I tried nCr where n = 6 and r = 2

The result was 15, but at the back of the book it says 64!

I am wondering where the number 64 come from.

Thanks in advance!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: In how many ways to answer a true-false test with 6 questions

**Physics Forums | Science Articles, Homework Help, Discussion**