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1. 10x + y = N... x=2y... 20y + y = N... N = 21 or 63... There are 2 such solns so the ans should be 20<n<90... also they havent specified the no is a 2 digit no... so it could be anything...
2.Don't solve this... there are more red marbles... hence the probability of getting a red marble will always be higher... A
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