Question

what is the average of frist 20multiples of 8??​

Answer 1

Answer:

1680

Step-by-step explanation:

8+16+24+....+160

a=8

d=8

an=160

sn= 20/2(8+160)

= 10*(168)=1680

average= 1680/20 =84

Answer 2

Step-by-step explanation:

First multiple of 8 is = 8

Second multiple of 8 is = 8 × 2 = 16

Similarly 20th multiple of 8 is = 8 × 20 = 160

So, AP is 8 + 16 + ……. + 160

∴ Average of AP = (First term + Last term)/2 = (8 + 160)/2 = 168/2 = 84