### Brain Teasers

# 64, 4, 16, 25, 9, 81, ?

What's the next number in this sequence?

64, 4, 16, 25, 9, 81, ?

64, 4, 16, 25, 9, 81, ?

### Hint

It will repeat after some entries.### Answer

49.Each number from the second is the square of the difference of the two digits of its preceding number. One-digit numbers are counted as two-digit numbers beginning with zero.

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