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  4. The number of ordered pairs of different prime numbers whose sum is not exceeding 26 and difference between second number and first number cannot be less than 10 .

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Q. The number of ordered pairs of different prime numbers whose sum is not exceeding 26 and difference between second number and first number cannot be less than 10 .

Linear Equations in Two Variables

Solution:

Write the prime numbers up to 23 , find the order pairs such that $x+y \leq 26$ and $y-x>10$.