Question

How many three-digit integers less than 501 have exactly two different digits in their representation (for example, 232, or 466)?

Answer 1

Step-by-step explanation:

499...1

494...2

488...3

484...4

477...5

474...6

466...7

464...8

455...9

454...10

433...11

434...12

422...13

424...14

411...15

414...16

404...17

399...18

393...19

388...20

383...21

377...22

373...23

366...24

363...25

355...26

353...27

344...28

343....29

322...30

323...31

311...32

313...33

303...34

.300...35

.400...36

.500...37

.

.

100...73

Your answer is 73.

Answer 2

Answer:

This is 89

Step-by-step explanation: