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Find the sum of all four digit numbers formed by the digits {1,2,3,….9} in which exactly two digits are prime and repetition of digits is not allowed

Answer»


Answer :`1111 [2+3+5+7^(3) C_(1). ""^(5)C_(2). 3! + (1+4+6+8+9) ""^(3)C_(2). ""^(5)C_(1).3!]`


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