Question 955371
There are 5 vowels: a, e, i, o, and u
There are 26 letters in all
There are 10 digits: 0 - 9
There are 5 even digits: 0, 2, 4, 6, and 8
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1st character: {{{ 5 }}} choices
2nd character: {{{ 10 }}} choices
3rd character: {{{ 26 }}} choices
4th character: {{{ 10 }}} choices 
5th character: {{{ 26 }}} choices
6th character: {{{ 5 }}} choices
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{{{ 5*10*26*10*26*5 = 1690000 }}}
possible postal codes