find the common difference of the AP 1/p,1-p/p,1-2p/p...
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a1 = 1/p
a2 = 1-p / p
a3 = 1-2p / p
d = a2 - a1
= ( 1- p - 1 ) / p
= -p / p
= -1
a2 = 1-p / p
a3 = 1-2p / p
d = a2 - a1
= ( 1- p - 1 ) / p
= -p / p
= -1
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