Question

solve for arithmetic progression :7+11/2+14...........84

Answer 1

As we know that,
Nth term = a+(n-1)d
Here,
a= 7
Nth term = 84
d = 11/2 -7 = -3/2.
So,
84 = 7+(n-1)(-3/2)
77 = n-1 *(-3/2)
n-1 = 77*2/(-3)
n = - 154/3 +1 = -151/3 , which is not possible.