Question

find the sum to 100 terms of the series 1+4+7+5+13+6​

Answer 1

Answer:

Sum =14950

Step-by-step explanation:

given:-

a= 1

d= a2-a1 = 4 - 1 = 3

n = 100

to find:-

s100

solution:-

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

s100 = 100/2 ( 2×1 + (100-1) 3 )

= 50 ( 2+ 99×3)

= 50 ( 2+297)

= 50×299

s100 = 14950