From the set of numbers {t, v, w, x, y, z}, how many different combinations can we have without the t in them? Ex:. (x,y), (x), (w,z,y,x), etc... and note that (x,y)=(y,x)	Choose the correct choice from the following
A) 8 B) 15 C) 16 D) 31 E) 32
Any letter (v, w, x, y, z) can be included or not.   Thus there are 2^5 combinations - 1 empty combination = 31 combinations   The answer is 31.
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From the set of numbers {t, v, w, x, y, z}, how many different combinations can we have without the t in them? Ex:. (x,y), (x), (w,z,y,x), etc... and note that (x,y)=(y,x)