Clouds

# When you see a sequence of high cirrostratus clouds followed by altostratus clouds and finally nimbostratus clouds near your home you can expect?

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## Related Questions

###### Asked in Math and Arithmetic

### What number is after 81 in the pattern 1 9 9 81 81 if the pattern is by 9's and 1's?

There are at least three possible answers, consistent with the
information given in the question. Short of reading the mind of the
person who posed the question, there is no way of determining which
of these (or other) solutions is the "correct" one.
Answer A: It is 81.
The sequence is 1 followed by 2 lots of 9^1, then 3 lots of n^2,
then 4 lots of n^3, etc.
Answer B: It is 729.
The sequence is 1 followed by pairs of powers of n.
Answer C: It is 6561.
The sequence is 1 followed by a pair of 9s, followed by a pair
of 9^2, followed by a pair of (9^2)^2, then ((9^2)^2)^2, etc.