Question

in an ap a8= 17 a19 = 39 find the common difference​

Answer 1

Answer:

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Answer 2

Answer:

a8 = 17

a + 7d = 17 ------(1)

a19 = 39

a + 18d = 39 -----(2)

Subtract eq.(2) from (1)

a + 7d = 17

a + 18d = 39

- -. -.

- 11d = 22

d = -22/11

d = -2

hence the common difference is -2

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