From the set of numbers {t, u, 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) Select the correct option.
A) 16
B) 31
C) 32
D) 63
E) 64
Any letter (u, v, w, x, y, z) can be included or not.   Thus there are 2^6 combinations - 1 empty combination = 63 combinations   The answer is 63.
<result>D</result>
From the set of numbers {t, u, 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)