self Maths Puzzle

the ratio of the monthly incomes of A and B is 3:4. The ratio of the monthly expenditures of A and B is 4:5. Which of the following representation possible value of the ratio of their savings?

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self Other Question

there are 10 pairs of socks in a cupboard from which four individual socks are picked at random.the probability that there is at least one pair is? REM OF 2^1040/131