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Questions  

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

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By Expert Faculty of Sri Chaitanya
a
880
b
629
c
630
d
879

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detailed solution

Correct option is D

(10 + 1)(9 + 1)(7 + 1) – 1 = 11×10×8-1=879
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The number of positive integral solutions satisfying the equation x1x2x3x4x5=240 is

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