Question

in A.P if a=2 and d=find the 5th term if an=3n+1 then find s2​

Answer 1

Step-by-step explanation:

an=3n+1

a5=3×5+1

a5=16

a4=4×3+1

=13

d=16-13=3

s2=n/2×(2a+(n-1)d)

=2/2×(2×2+1×3)

=1×(4+3)

=7

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