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Is 150 a term of the AP 11, 8, 5, …?

AYes
BNo
CCannot tell
DOnly if n positive
Answer & Solution
Correct answer: B. No
a = 11, d = −3. Set aₙ = 150: 11 + (n − 1)·(−3) = 150 ⇒ (n − 1)·(−3) = 139. n − 1 = −139/3, not an integer. **So 150 is not a term.**
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