a, a+d, a+2d, a+3d, a+4d, a+5d, a+6d, a+7d.
a4= a7-a5 = 2d
Therefore:
a2= a4 - d - d= 0
Thanks,
Matt
a4= a7-a5 = 2d
Therefore:
a2= a4 - d - d= 0
Thanks,
Matt
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