Math, asked by joseprincejosee, 1 year ago

The സും of first 6 terms of an AP is 42.Calculate the first term of an AP

Answers

Answered by jogender77

0

Sn = n / 2 (2a + (n - 1 ) d )
42 = 6/2 ( 2a + ( 6 - 1 ) d )
42 = 3 ( 2a + 5d )
14 = 2a + 5d
2a = 14 - 5d
A = 14 /2 - 5d / 2

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