SOLUTION: The coefficient of 5th 6th and 7th terms in the expansion ( 1+a)^7 in ascending powers of a forms the arithmetic progressions. Find the A.P

Question 1014396: The coefficient of 5th 6th and 7th terms in the expansion ( 1+a)^7 in ascending powers of a forms the arithmetic progressions. Find the A.P
Answer by ikleyn(52800) (Show Source): You can put this solution on YOUR website!
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The coefficient of 5th 6th and 7th terms in the expansion ( 1+a)^7 in ascending powers of a forms the arithmetic progressions. Find the A.P
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On binomial expansion see the lesson Binomial Theorem, Binomial Formula, Binomial Coefficients and Binomial Expansion in this site.

7-th term is .

6-th term is .

5-th term is .

 = 7;   =  = 21;   =  = 35.

This AP is  35,  21,  7.   Or 7,  21,  35 from the other end.

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