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64 is the next number

All the numbers have digits that add up to ten:

9 + 1 = 10 (91)

2 + 8 = 10 (28)

7 + 3 = 10 (73)

4 + 6 = 10 (46)

5 + 5 = 10 (55)

But there is more:

Also note that the 9 in 91 and then the 8 in 28 followed by the 7 in 73 and the 6 in 46. These alternate from first digits in 91 ( the 9) to the second digit in 28 (the 8) to the first digit in 73 etc. Similarly, the 1 is second in 91 but the 2 is first in 28 and the 3 is second. So there are two patterns, the digits add up to 10 and the alternating pattern I point out.

Since the last number is 55, we need a 6 in the first position and the means a 4 in the second position of the next number so it is 64, then we need 37.

9 + 1 = 10 (91)

2 + 8 = 10 (28)

7 + 3 = 10 (73)

4 + 6 = 10 (46)

5 + 5 = 10 (55)

6 + 4=10 (64)

3 +7=10 (37)

etc

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Q: What number best completes the sequence 91 28 73 46 55?
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