There are 52 white keys on a piano. The lowest key is A. The keys are designated A, B, C, D, E, F, and G in succession, and then the sequence of letters repeats, ending with a C for the highest key.

Question

a) If five notes are played simultaneously, in how many ways could the notes all be
i)A's? ii)G's? iii)the same letter? iv)different letters?
b) If five keys are played in order, how would your answer in part a) change?

How do you do iv from part a and part b for iv?

Answer 1

Check Steve's solution for the same question.

http://www.jiskha.com/display.cgi?id=1436351642

Answer 2

I suggest that you scroll down on this page and you will see the same question. Other people have already answered this.

Answer 3

I already saw this post and he didn't help with part IV with different letters. That's the part I'm having trouble on...