0
Anonymous
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15 of them.
27
6
More than one
Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77
There are 60480 numbers.
There are 4^6 = 4096 such numbers.
8.
If the digits are all different then 18. Otherwise, 192.
48 of them if digits may not be repeated. 100 if they can.
There are 2000 such numbers.
If you don't repeat, 20. If you do, 58.