MCQOPTIONS
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MCQOPTIONS
| 1. |
Let S be a set of fourteen natural numbers. The possible number of pairs (a, b), where a, b ∈ S and a ≠ b such that ab leaves remainder 1 when divided by 15, is |
| A. | 3 |
| B. | 5 |
| C. | 6 |
| D. | None of the above |
| Answer» E. | |