Let 1 m<n p. The number of subsets of the set A= 1,2,3, ,p having m,n as the least and the greatest elements respectively, is

JEE Advanced Mathematics question

Let . The number of subsets of the set having as the least and the greatest elements respectively, is

Answer: (B)

Such a subset must contain and , no element and no element . The only freedom is which of the integers strictly

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Question ID VK-108186