find an A.P whose sum of the first 3 terms is 21 and sum of their squares is 155
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In the A.P. the a= 7
d= 2 or -2
So the A.P. is 7,9,11,13,....
Or the A.P. is 7,5,3,1,-1,-3,.....
d= 2 or -2
So the A.P. is 7,9,11,13,....
Or the A.P. is 7,5,3,1,-1,-3,.....
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