in how many way a four digit even number can be formed by using the digits 4,5,9,8 exactly once
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Answer:
4589
4598
4859
4895
4985
4958
5489
5498
5849
5894
5984
5948
8459
8495
8549
8594
8954
8945
9458
9485
9548
9584
9854
9845
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