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Combination of n Different Things Taken One or More at a Time

The number of...

Question

The number of ways in which one or more balls can be selected out of $10$ white, $9$ green and $7$ black balls is

A

892

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B

881

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C

891

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D

879

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Solution

The correct option is D $879$
Required number of ways
$= (10 + 1) (9 + 1) (7 + 1) - 1 = 880 - 1 = 879$

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Combination of n Different Things Taken One or More at a Time

Standard XII Mathematics

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