self Maths Puzzle

Two squares are chosen at random on a chessboard. What is the probability that they have a side in common?

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self Other Question

276+587=905then
190+543=.............
s(D) denotes the sum of all natural numbers less than 100,containing the single digits natural number D as one of its digits.Find S(7)-S(3).option (1)220 (2)330 (3)440 (4)397