40, 40, 31, 31, 22, 22, 13, … choose which pair of numbers comes next?

by AdminX

40, 40, 31, 31, 22, 22, 13, … choose which pair of numbers comes next?

A. 13, 4
B. 13, 5
C. 4, 13
D. 9, 4
E. 4, 4

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