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teachoo.com
Example 10 - How many 4-digit numbers can be formed - Chapter 7
Example 10(Method 1)How many 4-digit numbers can be formed by using the digits 1 to 9 if repetition of digits is not allowed?n = Numbers from 1 to 9 = 9r = 4Required 4 digit number = 9P4 = 9!/((9 4)!) = 9!/5! = (9 8 7 6 5!)/5! = 3024Example 10(Method 2)
Feb 14, 2017
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