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I need to calculate the number of possible ratios for the following

R=1- (P1*S2/P2*S1) where P1,P2,S1,S2 are integers between 20 and 70?

Some one came up with a figure of 51*51*51*51 possible ratios but I don't know how this was determined. What branch of Math does this generally fall under...arithmetic sequences?

thanks

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# Calculate possible ratios

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