MathDB
Puerto Rico 2012 TST Problem 4

Source:

April 26, 2012
number theory proposednumber theory

Problem Statement

Let a,b,c,da, b, c, d be digits such that d>c>b>a≥0d > c > b > a \geq 0. How many numbers of the form 1a1b1c1d11a1b1c1d1 are multiples of 3333?
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