Answer:
multiples of 3 between 10 and 20 is 12,15 and 18
List the multiples of 3:
3, 6, 9, 12, 15, 18,21
The ones between 10 and 20 are:
12, 15, 18
The range is the difference between the highest and lowest numbers.
Range = 18 - 12 = 6
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