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If A={x|x is prime number and x<30}, fin...

If `A={x|x` is prime number and `x<30},` find the number of different rational numbers whose numerator and denominator belong to `Adot`

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Here, A={2,3,5,7,11,13,17,19,23,29}. A rational number is made by taking any two numbers in any order. Therefore, the required number of rational numbers is `.^(10)P_(2)+1` (including 1).
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