check whether -150 is a term of ap 11 18 15...
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We need to find N
So, A= 11
D= 18 - 11 = 7
An= -150
An = A+(N - 1)D
-150 = 11 + (N - 1) 7
-150 - 11 = (N - 1) 7
-161 / 7 = (N - 1)
-23 = N - 1
-23 + 1 = N
N = - 22
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