Question

if the sum of first 8 terms of an A.P. is 100 and the sum of its first 19 terms is 551, then the A.P. is​

Answer 1

Answer:

Let 'a' be the first term and 'd' be common difference

According to the question ,

(8/2)[2a+(8-1)d] = 100

⇒2a + 7d =25_____(1)

and (19/2)[2a + (19-1)d] = 551

⇒2a + 18d = 58____(2)

subtracting equation (1) and (2)

11d = 33

⇒d = 3

so a = (25 - 21)/2 = 2

so the  AP will be  = 2,5,8.11,14....

Mark it as brainliest dear

Answer 2

Answer:

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