Question

find the number of terms in AP, 100,96,92,........,12

Answer 1

heya it's Aastha.....

◆In an A.P :-

a = 100, d = -4 . an = 12 .

an = a +( n-1 ) d

12 = 100 + (n-1) -4

-88/-4 = n-1

22+1 = n

n = 23 .....

I hope it help you

Answer 2

a=100,d=96-100=-4
12=100+(n-1)(-4)
12-100=4-4n
-88-4=-4n
-92=-4n
n=23