Permutations and Combinations
How many 4 digit even number can formed by using the digits 1,3,7 and 8 only once?
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Answer:
six 4 digit even numbers can be formed by using the digits 1,3,7 and 8 only once,
Step-by-step explanation:
those numbers are
1378,1738,3718,3178,7318,7138
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