Question

The sum of first 8 term of an AP is 100 and sum of first 19 terms is 551. find AP.​

Answer 1

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Answer 2

Answer:

Step-by-step explanation:

sum of n terms in AP can be given by (n/2)*[2a+(n-1)d]

sum of first 8 terms = 4*[2a+7d] =100  

or 2a+7d = 25       (1)

sum of first 19 terms = (19/2)*[2a+18d] =551

or 2a+18d = 58      (2)

subtracting (2) - (1), we get

11d =33

d =3

2a+7*3= 25

a =2

hence the AP is 2,5,8,11...