Question

The am of a-3d, a-d,a+d, a+3d

Answer 1

am=(a-3d+a-d+a+d+a+3d)/4

=4a/4

=a

Answer 2

Answer:

The require arithmetic mean will be

=

$((a - 3d) + (a - d) + (a + d) + (a + 3d)) \div 4$

= 4a ÷ 4

= a (Answer)