1.

In the sum⊗ + 1 ⊗ + 5 ⊗ + ⊗ ⊗ + ⊗ 1 = 1 ⊗ ⊗ for which digit does the symbol ⊗ stand?

A. 2
B. 3
C. 4
D. 5
Answer» C. 4


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