Find the value of the middle term of the A.P. 7,13,19,........,247.

1.	Find the value of the middle term of the A.P. 7,13,19,........,247.
Answer» An = a + (n - 1)d241 = 7 + (n - 1)6241 - 7 = (n - 1)6234 = (n - 1)6234/6 = n - 139 = n - 1n = 40Now middle term =n/2=20An = 7 + (20 - 1)6= 7 + 19 × 6=7 + 114=121 Middle teri

Discussion