Question

in an A.P if d=-2, n=10,an=-11, then find a ​

Answer 1

D = -2 , n = 10 , an = 11

an = a + (n−1) d

11 = a + (10 - 1) (-2)

11 = a + (9) (-2)

11 = a + (-18)

11 = a - 18

11 + 18 = a

a = 29.

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