Between 100 and 300 how many will have digit 2 in the end, how many numbers would have digit 3 both in the end and the beginning?
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Between 100 and 300 how many will have digit 2 in the end, how many numbers would have digit 3 both in the end and the beginning?
how many will have digit 2 in the end, --- 20 numbers
how many numbers would have digit 3 both in the end and the beginning? -- No number between 100 and 300.
Using permutation [b]for the first part[/b] we can have only 2 at the unit's place and 10 possible numbers in the ten's place.and only 1 and 2 in the hundred place thus [b]2 * 10 * 1=20[/b]
[b]For the second part[/b] [b]no such number exists between 100 and 300[/b]