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JEE Main 2026 Mathematics question

MathematicsProbabilityJEE Main 2026

From a month of 31 days, 3 different dates are selected at random. If the probability that these dates are in an increasing A.P. is equal to , where a,b∈ℕ and gcd(a,b)=1, then a+b is equal to .

Answer: 944

Solution

The number of 3-term APs within 1..31 is $(31-2d) =

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Question ID VK-015355