Binomial TheoremHard
Question
If an = 
, then 
equals
, then equalsOptions
A.(n - 1)an
B.nan
C.
nan
nanD.None of these
Solution
Let b = 
= 
Let b = =
= nan -
(∵ nCr = nCn-r)
= nan - b
⇒ 2b = nan ⇒b = nan
= Let b = = = nan -
(∵ nCr = nCn-r) = nan - b
⇒ 2b = nan ⇒b =
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