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nth Term of A.P

Find the sum ...

Question

Find the sum of first three terms of the following sequence whose $n^{t h}$ term is $8 - 5 n$ .

A

- 9

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B

- 6

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C

6

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D

12

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Solution

The correct option is C $- 6$
Given, $T_{n} = 8 - 5 n$
So, $T_{1} = 8 - 5 = 3$
$T_{2} = 8 - 5 (2) = - 2$
$T_{3} = 8 - 5 (3) = - 7$
So, Sum of first three terms $= 3 - 2 - 7 = - 6$

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