Question

if the sum of n terms of an ap is 3n square + 5 and its m term is 164 find the value of m

Answer 1

Answer:m=157

Step-by-step explanation:

s1=3(1)+5=8=a1

s2=3(2)+5=17

a2=s2-a1= 17-8=9

d= a2-a1=9-8=1

am=164

a+(m-1)d=164

8+(m-1)1=164

(m-1)1=156

m-1=156

m=157