Question

Lf for an A.P.,S15 =225; find t8.

Answer 1

Answer:

8 TH TERM IS 15.

Step-by-step explanation:

$s15 = 225 \\ \\ \frac{15}{2} (2a + 14d) = 225 \\ \\ 2a + 14d = \frac{225 \times 2}{15} \\ \\ 2(a + 7d) = 15 \times 2 \\ \\ a + 7d = 15 \\ \\ therefore \: \: \: 8th \: term \: is \: 15.$