Help me with this problem
Asked by Marigold
24th April 2018,
12:23 AM
Answered by Expert
Answer:
This is a combination of two questions
first to get (r+1).nCr
multiply x(1+x)n........expansion of (1+x)n is given
differenciate x(1+x)n
rewrite the first term 25C0 25C3 as 25C0 25C23 ......so on in all the terms
each of the two terms are coefficient of x23
multiply brackets
Answered by Expert
24th April 2018,
5:50 PM
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