Since zero has infinitely many factors, it can be said that any pair of numbers (0,n) - where n is an integer - are a factor pair for zero.
1 = 1 * 1
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The factor pairs of 26 are: 1 × 26 2 × 13
Factor pairs of 16 are 1 and 16, 2 and 8, and 4 and 4.
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
1 and 3.
1 and 5