Question

Find the sum of the first 50 terms of the sequence below.

an=3n+2

Answer 1

@sourwing help me out please?

Answer 2

a1 = 3.1 +2
a2 = 3.2 +2
a3= 3.3 +2
a4= 3.4 +2
a5...........
.......................
......................
a50=3.50 +2
adding all we have
required sum = 3(1+2+3+4+..........50) +2*50
=3(50)(50+1)/2 +100
=3*25*51+100
=3925