Math, asked by deeparamesh2812, 1 month ago

The first term of an arithmetic sequence is 1 and the 20th term is 115.Find the sum of first 20 terms.

Answers

Answered by sunny0456

0

Answer:

S20 = 1160

Step-by-step explanation:

T1 = a = 1

T20 = 115

S20 = 20/2 [ 1 + 115 ] = 20/2 [116] = 10 * 116 = 1160

S20 = 1160

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