Q.

The number of ways of selecting 10 objects out 10 identical and 20 distinct objects is

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a

220−20C102

b

210+20C102

c

210−20C102

d

220+20C102

answer is D.

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Detailed Solution

No. of ways  =20C10+20C9+20C8+…+20C0=220+20C102
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