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1. |
Let S be a set of first 10 natural numbers. What is the possible number of pairs (a, b) where a, b ∈ S and a ≠ b such that the product ab (>12) leaves remainder 4 when divided by 12? |
A. | 4 |
B. | 6 |
C. | 8 |
D. | 10 |
Answer» D. 10 | |