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Every bit can be either 0 or 1. Therefore 4 bits can encode a maximum of 4 2 = 16 digits.
http://wiki.answers.com/Q/How_many_numbers_can_be_...
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there are 8 bits in a byte. 4 bytes =32 bit. a 32 but number holds 2. 32., or 4,294,967,296 numbers.
http://wiki.answers.com/Q/How_many_numbers_can_be_...
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After you sort, most checks will be easy.
http://www.quora.com/Computer-Programming/What-is-...
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1111 or 15 in decimal notation.
http://wiki.answers.com/Q/What_is_largest_number_a...
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