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Q: How many combinations are available with 16 digits?

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2 to the power 16.

With 4 digits you can have 24 = 16 combinations. 1 combination with 0 digits; 4 combinations with 1 digit: 1, 2, 4 and 8 6 combinations with 2 digits: 12, 14, 18, 24, 28 and 48 4 combinations with 3 digits: 124, 128, 148 and 248 1 combination with all 4 digits. In a combination the order of digits is not relevant so that 124 is the same as 142.

If you use them only once each, you can make 15 combinations. 1 with all four digits, 4 with 3 digits, 6 with 2 digits, and 4 with 1 digit. There is also a combination containing no digits making 16 = 24 combinations from 4 elements.

Assuming that "number" means digits and that it is permutations (rather than combinations) that are required, the answer is 816 which is 281.475 trillion (approx).

If you include the combination which comprises no numbers (the empty set), then there are 16: 1 with no digits 4 with 1 digit 6 with 2 digits 4 with 3 digits, and 1 with 4 digits.

16 digits.

16 digits.

A quadrillion is a 1 followed by 15 zeroes (1,000,000,000,000,000).Therefore, there are 16 digits in a quadrillion.

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there are 16 digits on a visa card

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16.

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The question does not specify how the the digits are to be combined: addition, multiplication, subtraction, division, power, other.

4 bits. 24 = 16, so you have 16 different combinations.4 bits. 24 = 16, so you have 16 different combinations.4 bits. 24 = 16, so you have 16 different combinations.4 bits. 24 = 16, so you have 16 different combinations.

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There are 16 digits on a Mastercard...not including the expiry date, of course.

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16 digits.

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There are 2, 1 and 6.

16 Digits:)

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