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Q.

The value of ∑r=020C6  50-r is equal to:

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a

51C7− 30C7

b

50C6− 30C6

c

50C7− 30C7

d

51C7+ 30C7

answer is A.

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Detailed Solution

∑r=020C6  50-r =50C6+49C6+......+31C6+C6 +  30  30C7−30C7=51C7−30C7
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