Question

if the sum of n terms of a sequence is given by S= 2n2+ 3n for all n belongs to natural number find the first four terms also find its 20th term​

Answer 1

Answer:

Step-by-step explanation:S(n)=2(n)^2+3n

S(20)=2×(20^2)+(3×20)

=2×400+60

=800+60

S(20)=860