Question

If 3 term of an AP is 4 then product of it's 5 term is

Answer 1

Answer:

$third \: \: term \: \: = a + 2d = 4 \\ \\sum \: \: of \: \: 5 \: \: terms \: \: = \frac{5}{2} (2a + 4d) = 5(a + 2d) = 5(4) = 20$