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If a and b are coprime positive integers such that

Let S(n) denote the sum of digits of the integer n. Over all positive integers, the minimum and maximum values of S(n)/S(5n) are
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The smallest possible positive value of 1−[(1/w)+(1/x)+(1/y)+(1/z)] where w, x, y, z are odd positive integers, has the form
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Joe picks 2 distinct numbers from the set of the first 14 positive integers S = \{1,2,3,\ldots,14\}. The probability that the
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4 distinct integers p, q, r and s are chosen from the set {1,2,3,…,16,17}. The minimum possible value of p/q+r/s can be
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2. asked by Sambaran G.
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4 distinct integers p, q, r and s are chosen from the set {1,2,3,…,16,17}. The minimum possible value of (p/q)+(r/s) can be
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4 distinct integers p, q, r and s are chosen from the set {1,2,3,…,16,17}. The minimum possible value of p/q+r/s can be
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2. asked by OIan
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Suppose f(x) is a degree 8 polynomial such that f(2^i)=1/2^i for all integers 0≤i≤8. If f(0)=a/b, where a and b are coprime
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The probability that a positive divisor of 60 is greater than 9 can be written as a/b, where a and b are coprime positive
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The probability that a positive divisor of 60 is greater than 9 can be written as a/b, where a and b are coprime positive
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Suppose that x and y are positive real numbers satisfying x^2 +y^2 =4xy . Then x−y/x+y can be written as �ãa/b, where a and
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