Question

How many numbers from 5000 to 6999 contain at lease one 3

Answer 1

Answer:

From 5000 - 6999 you have:

5000, 5100, 5200, 5300, 5400, 5500, 5600, 5700, 5800, 5900, 6000, 6100, 6200, 6300, 6400, 6500, 6600, 6700, 6800, 6900 which makes 20 groups of 100.

5300 and 6300 have 100 numbers each that contain at least 1 three. That leaves 18 groups that have 10 numbers with at least 1 three.

The result is 18 * 19 = 342 plus 2 * 100 = 200 total = 542 numbers with at least 1 three.

Hope it helps ya....