depends if you are allowed to repeat a number or not. If you are it's 6 times 6 times 6 times 6 = 1296 If not then it's 6 times 5 times 4 times 3 = 360
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16
The greatest 4-digit number that is divisible by 16 is 9984
There are 12C4 4 NUMBER combinations. And that equals 12*11*10*9/(4/3/2/1) = 495 combinations. However, some of these, although 4 number combinations consist of 7 digits eg 1, 10, 11, and 12. Are you really sure you want 4-DIGIT combinations?
16. There are two choices for the first digit (3 and 6). For either choice of first digit there are two choices for the second digit, and so on. 2 x 2 x 2 x 2 = 16.
Assuming the digits are not repeated, there are four combinations:123, 124, 134 and 234.