Question

The sum of first n terms of an AP is given by S. = 2n + 3n. Find the sixteenth
term of
the AP.
​

Answer 1

S=5n

S1=5*1=5=a

S2=5*2=10=a+a2

a2=10-5=5=a+d

d=5-5=0

a16=a+15d=5+15*0=5