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Question Number 3023 by Rasheed Soomro last updated on 03/Dec/15
$$\mathrm{Pl}\:\mathrm{notice}\:\mathrm{the}\:\mathrm{answer}\:\mathrm{of}\:\underset{−} {\mathrm{Q2771}},\mathrm{I}\:\mathrm{have}\:\mathrm{updated}\:\mathrm{it}. \\ $$
Answered by prakash jain last updated on 04/Dec/15
$$\mathrm{I}\:\mathrm{think}\:\mathrm{the}\:\mathrm{answer}\:\mathrm{should}\:\mathrm{be} \\ $$$$\frac{\mathrm{number}\:\mathrm{of}\:\mathrm{rectangles}\:\mathrm{in}\:\mathrm{7}×\mathrm{7}\:\mathrm{grid}\:\left(\mathrm{8}×\mathrm{8}\:\mathrm{points}\right)}{\mathrm{number}\:\mathrm{of}\:\mathrm{ways}\:\mathrm{to}\:\mathrm{select}\:\mathrm{4}\:\mathrm{points}=^{\mathrm{64}} {C}_{\mathrm{4}} } \\ $$