SOLUTION: In how many ways can you form a three-digit numbers greater than 300 using the digits 1, 2, 3, 4 if: a. repetition is allowed? b. repetition is not allowed?

Question 1174675: In how many ways can you form a three-digit numbers greater than 300 using the digits 1, 2, 3, 4 if:
a. repetition is allowed? b. repetition is not allowed?

Answer by ikleyn(52831)   (Show Source): You can put this solution on YOUR website!
.

(a)   2*4*4 ways.

      There are 2 possibilities for the first digit (the digits 3 or 4) and 4 possibilities for the 2nd and 3rd positions.

(b)   2*3*2 ways.

      There are 2 possibilities for the first position (the digits 3 or 4);

      3 possibilities of remaining digits for the 2nd position and
      2 possibilities of remaining digits for the last position.

RELATED QUESTIONS
In how many different ways can we form a number of 4 digits from digits 1, 2, 3, 4, 5, �... (answered by lynnlo)

In how many different ways can we form a number of 4 digits from digits 1, 2, 3, 4, 5, �... (answered by lynnlo)

How many four-digit numbers can be formed using the digits 1,2,3,4,5,6,7,8, and 9. a) if (answered by Fombitz)

Find three digit even numbers greater than 300 that can be formed from the digits 1, 2,... (answered by stanbon)

2. Three-digit numbers are formed using the digits 0, 1, 2, 3, 4, 5 and 6. Note that a... (answered by KMST)

how many three placed numbers less than 300 can be formed with the digits 1, 2, 3, and 5... (answered by stanbon)

How many two-digit even numbers can you form using the digits 0, 1 , 2, 3, 4, 5, 6, 7, 8, (answered by greenestamps)

How many two-digit even numbers can you form using the digits 0, 1 , 2, 3, 4, 5, 6, 7, 8, (answered by greenestamps,ikleyn)

How many two-digit even numbers can you form using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8,... (answered by Edwin McCravy,ikleyn)