Answer:
3
Solution:
If the number is divisible by both 2 and 3, the number is divisible by 6.
20 - 6 = 14
14/6 = 2
Since 6 is also divisible by both 2 and 3, we also add 1 to 2.
Therefore there are 3 numbers which is divisible by both 2 and 3
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