Question

middle term of A. P:4, 7,10,.....154 is​

Answer 1

an = a +(n -1 ) d

154 = 4 + ( n - 1 ) 3

154 - 4 ( n- 1 ) 3

150 / 3 = n - 1

50 = n - 1

n = 51

so the middle term is a25 ( approximately)

a25 = a + (n-1)d

a25 = 4 + 24 × 3

a25 = 4 + 68

a25 = 72..

Answer 2

72 is the middle term of an ap