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

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) 6 (c) 7 (d) 8

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The correct Answer is:
6
`n/2 (a+l) =36 Rightarrow n/2 xx(1+11) =36 Rightarrow n=6`
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