Name all of the three-digit numbers that contain the digits 5 and 6

Question

Name all of the three-digit numbers that contain the digits 5 and 6. Please list all of them. Thanks.

Answer 1

the 5 and the 6 can be in the first two places, the last two places, or the first and the last place

you have to be careful of repetitions

56_

55_

65_

66_

what digits can go in the last place for each one ?

 

_56

_55

_65

_66

what digits can go in the first place for each one ? (a number does not begin with a zero as the left-most digit)

 

5_6

5_5

6_5

6_6

what digits can go in the middle place for each one ?