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Sum of 'n' Terms When 'a' and 'l' Is Given

If the first ...

Question

If the first term of an AP is -8 and the common difference is 4, then the sum of the first ten terms is

A

104

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B

96

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C

100

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D

92

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Solution

The correct option is C 100
$S_{n} = \frac{n}{2} [2 a + (n - 1) d] S_{10} = \frac{10}{2} (2 (- 8) + 9 (4)) S_{10} = 100$

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