Mathematics - Sequence & Series Question with Solution | TestHub

MathematicsSequence & SeriesA.P.Easy2 minQB

MathematicsEasyinteger

All terms of an A.P. are natural numbers. The sum of its first nine terms lies between 200 and 220 . If the second term is 12 , then first term is

Answer:

Solution:

According to the given condition

$200 < \frac{9}{2} (2 (12 - d) + 8 d) < 220 \Rightarrow d = 4$

∴ First term $= 12 - d = 8$

Stream:JEESubject:MathematicsTopic:Sequence & SeriesSubtopic:A.P.

⏱ 2mℹ️ Source: QB

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