The number of ways in which one or more balls can be selected out of 10 white, 9 green and 7 blue balls is  Pick:
A) 892	B) 881	C) 891	D) 879	E) None of these
The required number of ways   = (10 + 1)(9 + 1)(7 + 1) - 1 = 879.   Answer 879
<result>D</result>
The number of ways in which one or more balls can be selected out of 10 white, 9 green and 7 blue balls is