Question
Question: Out of 10 white, 9 green and 7 black balls, one can select one or more balls in...
Out of 10 white, 9 green and 7 black balls, one can select one or more balls in
A
880 ways
B
630 ways
C
879 ways
D
None of these
Answer
879 ways
Explanation
Solution
None, one or more white balls can be selected out of 10 in 11 ways.
None, one or more black balls can be selected out of 7 in 8 ways.
Hence, a selection of none, one or more balls from the given lot can be made in 11x10x8= 880 ways. This includes one way when no ball is selected.
Hence, the required number of ways.
= 880 – 1 = 879