Question

the sum of three number in AP is 15 and the product of 1st and the last is 21 find the number​

Answer 1

answer is 3,5,8

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Explanation:

terms a-d , a , a+d

sum = 15

a = 5

(5-d)(5+d) = 21

25+5d-5d-d(d) = 21

d(d) = 4

d = √4

d = 2