How many strings of four decimal digits (Note there are 10 possible digits and a string can be of the form 0014 etc
(a) have exactly three digits which are 9s?
Homework Answers
This can be in the four following ways.
X999 or 9X99 or 99X9 or 999X
In each case X can represent 9 possible digits including 0 but excluding 9.
So the number of strings is 4*9=36.
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