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The value of r for which 20cr 20c0+ 20cr−120c1+20cr−220c2+…20c020cr is maximum,  is



Question ID - 56975 | SaraNextGen Top Answer

The value of r for which 20cr 20c0+ 20cr−120c1+20cr−220c2+…20c020cr is maximum,  is

1 Answer
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Answer Key / Explanation : (20) -

Given sum=coefficient of xr in the expansion of (1+x)20 (1+x)20,  which is equal to 40cr It is maximum when r=20

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