20.
Find how many 4 digit numbers can be formed by using the digits 1, 2, 3,4 5 without repetition how many of these are less than 2000
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These 4 digits selected can be arranged in 4! ways. Hence the answer is 24 such numbers can be formed
Step-by-step explanation:
1234, 1243, 1324, 1342, 1423, 1432
1534, 1543, 1354, 1345, 1453, 1435
1254, 1235, 1524, 1542, 1425, 1452
1235, 1253, 1325, 1352, 1523, 1532
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