Ex 3.1, 1 Write all the factors of the following numbers : (c) 21 1 × 21 = 21
2 ×
3 × 7 = 21
4 ×
5 ×
6 ×
7 × 3 = 21
We stop here as 7 and 3 have occurred earlier
Factors of 21 are 1, 3, 7, 21
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