Question

find S5 of the A.P 8,6,4​

Answer 1

Answer:

Here

Step-by-step explanation:

$here \: ap \: is \: 8 \: 6 \: 4 \: \\ t1 = a= 8 \: \: \: t2 = 6 \: \: \: t3 = 4 \: \\ d = - 2 \\ s5 = \frac{n}{2} {2a + (n - 1)d} \\ = \frac{5}{2} {(2 \times 8) + (5 - 1) - 2} \: \\ = \frac{5}{2} (2 \times 8) + 4( - 2) \\ = \frac{5}{2} (2 \times 8 - 8) \\ = \frac{5}{2} \times 2(8 - 4) \\ = 5 \times 4 \\ s5 = 20$

Here is your answer mate

Hope it will help you

Answer 2

Answer:

8

Step-by-step explanation:

= 2×8+ (5-1) d

= 16+4×-2

= 16-8

= 8