Hindi, asked by vanshul6984, 11 months ago

If the nth term of an A.P. is given by a., = 5n-3, then the sum of first 10 terms if
(a) 225
(c) 255
(b) 245
(d) 270

Answers

Answered by Anonymous
8

Answer:

an = 5n - 3 \\

  • n = 1

a1 = 5(1) - 3 \\ a1 = 2

  • n = 2

a2 = 5(2) - 3 \\ a2 = 7

  • n = 3

a3 = 5(3) - 3 \\ a3 = 12

AP : 2, 7, 12,............

a = 1 \\ n = 10 \\ d = 5

sn =  \frac{n}{2} (2a + (n - 1)d) \\ s10 =  \frac{10}{2} (2(2)  + 9(5)) \\ s10 = 5(4 + 45) \\ s10 = 5(49) \\ s10 = 245

Therefore, answer is (b)245.

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Answered by Anonymous
3

Answer:

(b)245

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