Answer:
5040 nine digit numbers
Word solution:
There are 9 digits in 222778889, in which there are three 2's, two 7,s, three 8's and 9.
So number of 9 digit number formed by arranging them = 9!/(3!*2!*3!*1!)= 5040.
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Answers & Comments
Answer:
5040 nine digit numbers
Word solution:
There are 9 digits in 222778889, in which there are three 2's, two 7,s, three 8's and 9.
So number of 9 digit number formed by arranging them = 9!/(3!*2!*3!*1!)= 5040.