View Solution How many 4-digit numbers are there, when a digit may be repeated any number of times? View Solution How many 3-digit numbers are there when a digit may be repeated any number of times? View Solution MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS -EXERCISE 7 (d) Short Answer...
There are 9⋅10=90 possible values for the first two digits. One-third of them yield a multiple of 3, so the answer is 903=30.结果一 题目 How many distinct four-digit numbers are divisible by 3 and have 23 as their last two digits?( )A.27B.30C.33D.81E.90 答案 B相关推荐 1...
How many arrangements of the word "permutation" are there in which the letter P is not followed immediately by the letter R? How many more possible arrangements can be made using the letters of the word PERMUTATIONS than using the letters of the word COMB...
Consider the three-digit numbers that can be formed from the digits 1, 2, 3, 4, and 5 with no repetition of digits allowed. a. How many of these are even numbers? b. How many are greater than 250? How many four-digit numbers can there be i...
Subsets of {2,3,4,5,6,7,8,9} indude a singe digit up to all eigh tnumbers.Therefore,we must add the combinations of all possible subsets and subtract from each of the subsets fomed by the composite numbers. Hence: (81)−(41)+(82)−(42)+(83)−(43)+(84)−1+(85)...
How many 4-digit number can be formed with the digit 1, 2, 3, 4, 6 and 8 if repetition of digits is not allowed.
There are many more missions I could list, but let’s focus on Mission Six because it’s really important. My friend Luca Lampariello talks a lot about finding topics you’re interested in and then starting to translate them into your mother tongue. I’m big into memory, so naturally I ...
Though a PIN should be easy to remember, there are certain pitfalls a user should attempt to avoid. Avoid using obvious combinations such as "0000" as these are the most common PIN numbers and are easy to guess. Consider using a random combination of numbers that you can remember easily bu...
Example problem:If there are 5 people, Barb, Sue, Jan, Jim, and Rob, and only three will be chosen for the new Parent Teacher Association, how many combinations are possible for the committee? Enter the number of items on the home screen (the main input area) that you have to c...
How many license plate combinations are there? How many different license plates have the letters s-a-m in that order? The number of different license plates that have s-a-m in that order is ... A state's license plate consist of 3 letters...