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If you have 30 single socks, you would be able to make 15 pairs. This is because each pair consists of two socks. So, when you divide 30 by 2, you get 15 pairs.
The number 4 has two factor pairs. 1 x 4 and 2 x 2
2, 3, and 5 are factors of 30 and all multiples of 30.
Four pairs: 54 and 1 27 and 2 18 and 3 9 and 6