Post a New Question

math

posted by .

How many 4-digit whole numbers are there? For example, 1220 is acceptable but 0678 is not.

How do you do permutation and repetition?

  • math -

    since first bar cannot be a zero possibiltiies of first numeral is 9, and since repition is allowed, the last 3 slots are allowed to be 10 therefore,
    9 x 10 x 10 x 10 (had u forgotten that it said even or odd numbers only, just simply divide by 2) other than that the answer is 9000.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question