Question

In AP a4=17, a7=23 find d and a

Answer 1

ANSWER::--»

A4 = A+3d = 17 ____(1)

A7 = A+6d = 23_____(2)

From (1) and (2)

(a+3d) +(a+6d) = 17+23

2A + 9d = 40

9d = 40-2a

9d = 2(20-a)

9d/2 = 20 - a ..................

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Answer 2

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