How many numbers are there between 99 and 1000 having 7 in the units place?

Dear student,

numbers between 100 and 1000 = 900
numbers between 100 and 1000 which do not have digit 6 in any place = 8 x 9 x 9 = 648
Unit digit could take any value of the 9 values (0 to 9, except 6)
Tens Digit could take any value of the 9 values (0 to 9, except 6)
Hundreds digit could take any value of the 8 values (1 to 9, except 6)

numbers between 100 and 1000 which have atleast one digit as 6 = 900 - 648 = 252

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