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Question
The 31st term of the AP whose first two terms are respectively −2 and −7 is
The 31st term of the AP whose first two terms are respectively −2 and −7 is
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Solution
The correct option is A −152
Given, a1=−2,a2=−7
⇒d=a2−a1=−7−(−2)=−7+2=−5
Since, an=a+(n−1)d
⇒a31=a+30d=−2+30(−5)=−152
∴ Option A is correct.
Given, a1=−2,a2=−7
⇒d=a2−a1=−7−(−2)=−7+2=−5
Since, an=a+(n−1)d
⇒a31=a+30d=−2+30(−5)=−152
∴ Option A is correct.
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