Question

Find the middle term of the AP 15, 21, 27,... ... ..., 135

Answer 1

Hey
Here is your answer
a=15
d=21-15
=6
Tn=135
Tn = a+(n-1)d
135 = 15(n-1)6
135-15 = (n-1)6
120 = (n-1)6
(n-1) = 120/6
(n-1) = 20
n = 20+1
n = 21
middle term = 21+1/2
= 22/2
=11
Tn = a+(n-1)d
= 15+(11-1)6
= 15+60
= 75
HOPE IT HELPS U
PLZZ MARK BRAINLIEST☺☺☺