Check whether -150 is a term of the AP: 11,8,5,2....
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-150 = a + (n-1)d
-150 = 11 (n-1)-3
-161 = 3 - 3n
-164 = -3n
n = 164 / 3
-150 is not a term of AP
-150 = 11 (n-1)-3
-161 = 3 - 3n
-164 = -3n
n = 164 / 3
-150 is not a term of AP
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