If the coefficient of ar-1,ar and ar+1 in the expression of (1+a)n are in arithmetic progession Prove that n2-n(4r+1)+4r2-2=0 - Maths - Binomial Theorem

Question

If the coefficient of ar-1,ar and
ar+1 in the expression of (1+a)n are in
arithmetic progession Prove that
n2-n(4r+1)+4r2-2=0

Aakash Sharma · Accepted Answer

You can view the mentioned in NCERT >> Pg - 172
>> Example - 11 If you still have any doubts about
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If the coefficient of ar-1,ar and ar+1 in the expression of (1+a)n are in arithmetic progession. Prove that n2-n(4r+1)+4r2-2=0