2,4 / 3,6 / 7,8 / 13,10 / 21,..., then what is the nth number? (expressed by an algebraic expression containing n) Such as the title

2,4 / 3,6 / 7,8 / 13,10 / 21,..., then what is the nth number? (expressed by an algebraic expression containing n) Such as the title

2n/[n(n-1)+1]

The maximum factor of a number is 18, and the minimum multiple of the number is 18______ ．

The maximum factor of a number is 18, that is, 18 is itself, so the number is 18, and the minimum multiple of the number is itself, that is, 18

The minimum multiple of a number is 18. All the factors of the number are ()

The minimum multiple of a number is 18. All the factors of this number are (1,2,3,6,9,18)

The minimum multiple of a number is 18, the number has () factors, and the maximum factor of the number is ()
Explain why,

Since the minimum multiple of any number is itself, the number is 18, which has six factors: 1, 2, 3, 6, 9 and 18. The maximum factor of this number is 18