Mathematics, 30.06.2021 09:30 chantihock05
A 4-digit code is to be formed using 4 different numbers selected from 1, 2, 3, 4, 5, 6, 7, 8 and 9. Find how many different codes can be formed if (a) there are no restrictions, (b) only prime numbers are used, [2] (c) two even numbers are followed by two odd numbers,
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A 4-digit code is to be formed using 4 different numbers selected from 1, 2, 3, 4, 5, 6, 7, 8 and 9....
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