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Sum of n Terms

Find the sum ...

Question

Find the sum of first 6 terms of an AP whose first term is 1 and sixth term is 6.

A

21

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B

19

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C

20

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D

18

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Solution

The correct option is A 21

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If the sum of first 6 terms of an AP is 36 and that of the first 16 terms is 256, then find the sum of first 10 terms.

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