Question

solve this question guys
it's easy but critical ​

Answer 1

Answer:

NETWORK ERROR.........

SOLLY YL!!

Answer 2

Step-by-step explanation:

lets the four no in AP are

a-3d,a-d,a+d,a+3d

where a is first term and d is common difference

by given conditions

a-3d+a-d+a+d+a+3d=28

4a=28

a=7

now square of numbers and add we get

(a-3d)²+(a-d)²+(a+d)²+(a+3d)12

a²+9d²-6ad+a²+d²-2ad+a²+9d²+6ad+a²+d²+2ad =216

plz sovle further

thank you