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Q.

The value of ∑r=010 r10Cr3r(−2)10−r is

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a

20

b

10

c

300

d

30

answer is D.

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Detailed Solution

∑r=010 r10Cr3r(−2)10−r=10∑r=010 9Cr−13r(−2)10−r=10×3∑r=010 9Cr−13r−1(−2)10−r=30(3−2)9=30

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