Is -150 a term of the A.P. ?
a = 11, d = -3
An= a + (n – 1) d
-150 = 11 + (n – 1) (-3)
-150 = 11 – 3n + 3
-150 = 14 – 3n
-164 = 3n
Since, -164 is not divisible by 3
Therefore, -150 isn’t the term of the given A.P.