Questions
If, then value of is
a
1
b
0
c
nx
d
ny
detailed solution
Correct option is D
We have (a+t)n=∑r=0n nCran−rtr Differentiating both the sides with respect to t, we get n(a+t)n−1=∑r=0n r nCran−rtr−1Multiplying both the sides by t and putting a = x and t = y, we getn(x+y)n−1y=∑r=0n r nCrxn−ryr ⇒∑r=0n r nCrxn−ryr=ny [∵ x+y=1]Talk to our academic expert!
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