Question

Find the sum of first 25 terms of AP: 2, 5, 8, .....253​

Answer 1

Answer:

950

HOPE IT WILL HELP YOU

Answer 2

Answer:

given AP 2,5,8,. 253

a=2 ,t2=5

d=5-2=3

a=2,d=3,n=253

by formula

Tn=a+n-1×d

253=2+(n-1)d

253=2+3n-3

253=1+3n

253-1=3n

252=3n

252/3=n

n=84

Sn=n/2 (2a+n-1d)

S84=84/2(2×2+(84-1)×3

42×249 =10458