how to select the numbers in ap
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if there are 3 numbers, choose- a-d, a, a+d
if there are 4 numbers, choose, a-3d, a-d, a+d, a+3d.
if there are 5 numbers, choose, a-2d, a-d, a, a+d, a+2d
if there are 4 numbers, choose, a-3d, a-d, a+d, a+3d.
if there are 5 numbers, choose, a-2d, a-d, a, a+d, a+2d
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