First slide

Combinations

Question

Assuming the balls to be identical except for difference in colours, the number of ways in which one or more balls can be selected from 10 white, 9 green and 7 black balls is

Moderate

A

880
B

629
C

630
D

879

Solution

(10 + 1)(9 + 1)(7 + 1) – 1 = $11 \times 10 \times 8 - 1 = 879$

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