When six fairs coins are tossed simultaneously, in how many of the outcomes will at most three of the coins turn up as heads ?

When six fairs coins are tossed simultaneously, in how many of the

1.	When six fairs coins are tossed simultaneously, in how many of the outcomes will at most three of the coins turn up as heads ?
A.	15
B.	42
C.	16
D.	40
Answer» C. 16