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0 votes
14.1k views
in Mathematics by (79.8k points)

If in an A.P. a1 , a2 , a3 , ...; a7 = 9, then a1 a2 a7 is least when the common difference is

(1) 23/20 

(2) 13/22 

(3) 43/20 

(4) 33/20

1 Answer

+1 vote
by (76.1k points)
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Best answer

Correct option (4) 33/20

Explanation:

a7 = a + 6d = 9 

⇒ a = 9 − 6d 

(where a is the first term and d is the common difference of the A.P.)

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