Question

the arithmetic mean of d-2, d, d+2 is​

Answer 1

Answer:

In series a,a+d,a+2d..........a+2nd

The first term =a , common difference=d

Term =2n+1

Last term =a+2nd

We know that sum of series

=

2

2n+1

(fist term+last term)

=

2

2n+1

(a+a+2nd)=(2n+1)(a+nd)

Then mean of series

=

2n+1

sum of series

=

n

(2n+1)(a+nd)

=(a+nd)

Answer 2

Step-by-step explanation:

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