Question

find the sum of the first 50 terms of the arithmetic progression, given that the 15th term is 34 and the sum of the first 8 terms is 20

Answer 1

know the formulas for sum and n'th term of AP ??

Answer 2

n'th term is \(a_n =a_1+(n-1)d\)
so 15th term = 34 gives
34 = a1+14d ----> (1)
got this ?

Answer 3

yeah got the formula

Answer 4

sum of the first terms is 20
sum of 1st how many terms is 20 ?

Answer 5

its 8 terms sorry

Answer 6

so can u make the 2nd equation using sum formula ?
just put n= 8, Sn = 20.

Answer 7

thanks

Answer 8

u got the answer ?

Answer 9

yeah thanks so much

Answer 10

welcome ^_^