what is the coefficient of the last term (a-b)^5..?
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Answer:
It is given that T6+T5=0.
Hence nC4an−4b4−nC5an−5b5=0
nC4an−4b4=nC5an−5b5
nC4a=nC5b
(n−4)!4!n!a=(n−5)!5!n!b
(n−4)a=5b
Therefore
ba=5n−4
Answered by
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Step-by-step explanation:
The coefficient of the last term in the binomial expansion of (a - b)^5
= 5C5 × (-1)^5 = 1×-1 = -1.
the last term= - b^5.
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