3 years ago

How many 4 character login names can be created if the first two are digits and the last two are letters and none can repeat?

Mathematics

1 answer:

netineya [11]3 years ago

7 0

Answer:

58500

Step-by-step explanation:

since we have 10 numeric characters i.e

0,1,2,3,4,5,6,7,8,9

and similarly have 26 alphabetical characters

A - Z

Now we want to make a 4 characters login name with first two characters as digits and last two as letters without repetition

.•. 10 * 9 * 26 * 25=58500

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