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The first and last terms of an A.P. are ...

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36 then the number of terms will be
a.`5` b. `8` c. `6` d. 7

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`n/2(a+l)=36`
`=>n/2×(1+11)=36`
`=>n=6`
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