Các câu hỏi tương tự
How many 5-digit numbers contain all the digits 1, 2, 3, 4 and 5 and have the property that the difference between each pair of adjacent digits is at least 2?
How many 5- digit numbers are greater than 40000 that ues the digits 1,2,3,4 and 5, and the digits cannot be repeated
When a particular six-digit number is multiplied by 2, 3, 4, 5 and 6 respectively, each of the
products is still a six-digit number with the same digits as the original number but in a different
order. Find the original number.
find a 2 - digit natural number such that it is equal to two times product of two digits
ind a 2 - digit natural number such that it is equal to two times product of two times product of two digits
We use 8 digits 0, 1, 2, 3, 4, 5, 6, 7 to form all 5-digit natural numbers consisting of distinct digits. Find the sum of all numbers that can be formed
Of the numbers 1,2,…,1000, how many numbers are divisible by neither 6 nor 9?
Answer:
24 4- digit number can be formed by using 1,3,5 and 7, with each digit being used exactly one each time. Find the average of these 24 numbers?
find the number of integer between 1 and 2000 with the property that the sum of digits equals 9