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The pattern is /4*6/5*7/6 so next is *8, or 56.

More clearly:

20 (divided by 4) = 5

5 (times 6) = 30

30 (divided by 5) = 6

6 (times 7) = 42

42 (divided by 6) = 7

Every other number they switch from multiplication to division or vice versa, and the number being multiplied or divided goes up by one, so the odd numbers in the group (the first, third, and fifth numbers ie 20, 30, and 42) are divided by 4, 5, 6, 7, etc. to get the next even numbers. The even numbers in the group (5, 6, and then 7) are multiplied by 6, 7, and then 8.

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15y ago

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56

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13y ago
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Q: What number Complete sequence 20 5 30 6 42 7?
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