check that - 150 is a term of arithmetic progression of 11, 8, 5, 2
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11,8,5,2
a=11,d=8-11=-3,an=-150
an=a+(n-1)*d
-150=11+(n-1)*(-3)
-150-11=-3n+3
-161-3=-3n
-164=-3n
3n=164
n=164/3
n=54.33
since,n is coming in decimal.
Hence,-150 is not a term of an A.P.
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