Question

which term of the A.P series 99,92,85...is 15?​

Answer 1

Answer:

n = 13

Step-by-step explanation:

We know that tn = a + (n-1) d

tn = required term = 15

a = first term =  99

n = number of term

d = common difference = 92-99 = -7

15 = 99 + (n-1)(-7)

15 = 99 + 7 -7n

7n = 91

n = 13

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