Q.20. Find whether -150 is a term of the AP 17, 12, 7, 2……
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Answer:
a=17, d=-5
an=a+(n-1)d
-150=17(n-1)×-5
-150-17=(n-1)×-5
-167=(n-1)×-5
(n-1)=167/5
n=167/5+1
n=172/5
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