Question

Solve the eqn: 2 + 5 + 8 + 11 + ... + x = .345 please fast

Answer 1

2+ 5 + 8 + 11 + 15+ x = 345

here 15 Becuz there is a difference of 3 after every digit 5-2= 3

adding all these we get

36 + x = 345
Now

x = 345-36
= 309 ans


HOPE IT HELPS