What is the 12 term of the AP is -41. If the first is 3. Find the 20 term.

Answer 1

Tn = a + (n-1) d = 3 + (n-1) d
T12 = 3 + 11 d = - 41
so 11 d = -44
d = -4
T20 = 3 + 19 * -4
= 3 - 76 = - 73