Same thing as others wrote but written slightly differently.
The missing number is 27
It is a matter of spotting the relationship if you can. If not obvious you will need to experiment to find what type of sequence it is; geometric or arithmetic.
Observe that there is a connection of 3 in the numbers 1,3,9 in that
##1xx3=3##
Lets experiment with that for a moment!
If we apply the same rule to 3 what will we get?
##3xx3=9## which is correct.
Ok. lets apply the same rule yet again!
##9xx3=27##
Using 27, if we apply the rule once more and get 81 we have found the correct ‘rule’ for this sequence.
##27xx3=81##
‘~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This works so the missing number is 27
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