a, b, c, d are positive integers.
The sum of products of triples is equal to the sum of products of pairs:
abc+abd+acd+bcd = ab+ac+ad+bc+bd+cd = X
What is the value of X?
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a, b, c, d are positive integers.
The sum of products of triples is equal to the sum of products of pairs:
abc+abd+acd+bcd = ab+ac+ad+bc+bd+cd = X
What is the value of X?