SOLUTION: What is the probability that a 4-digit number of the type abcd (a, b, c, d are all different) is a multiple of 11?
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Question 935157: What is the probability that a 4-digit number of the type abcd (a, b, c, d are all different) is a multiple of 11? Answer by MathLover1(20850) (Show Source):
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or,
there are multiples of between and , and the total number of 4-digit numbers are : so, simply divide
