Ask Question
24 December, 11:43

How many 3-digit numbers have a first digit which is triple the final digit?

+2
Answers (1)
  1. 24 December, 15:10
    0
    I think the answer is 30.

    The first digit can be one of three digits {3, 6, 9} corresponding to the last digit being {1, 2, 3}, and for each of those three digits, the middle digit can be one of ten digits {0 - 9}, making 3 x 10 = 30 such numbers.

    It is assumed that a 3 digit number is a number in the range 100-999, excluding numbers starting with a leading zero, eg 090 is not considered a 3 digit number (though it would be a valid 3-digit number for a combination lock with 3 digits).
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “How many 3-digit numbers have a first digit which is triple the final digit? ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers