How many 3-digit numbers can you write using only digits 1 and 7? (Of course, digits can repeat.) How many 3-digit numbers can y

Question

3 years ago

13

ou write using only digits 1 and 7? (Of course, digits can repeat.)

2 answers:

Inessa05 [86] · Answer 1 · 2021-12-30T11:50:26+03:00

Answer:

Short answer 2 * 2 * 2 = 8

Step-by-step explanation:

The first digit can be either a 1 or a 7. You have 2 choices.

Once you have decided you can write either a 1 or 7 for the second which is 2 choices

Same with the third.

The numbers are

1 * 1 * 1

1 * 1 * 7

1 * 7 * 1

1 * 7 * 7

7 * 1 *1

7 * 1 * 7

7 * 7 *1

7 * 7 *7

Lana71 [14] · Answer 2 · 2021-12-30T09:25:41+03:00

7 0

Answer:

111,117,177,777,771,711,717,171

Step-by-step explanation: