A 4 - digits numbers divisible by all of the numbers from 1 to 10 without any remainder. Find the smallest possible value of the 4-digits number

A 4 - digits numbers divisible by all of the numbers from 1 to 10 without any remainder. Find the smallest possible value of the 4-digits number

A 4-digits number is divisble by all of the numbers from 1 to 10 ưithout any remainder .

find the smallest possible value of the 4 - digit number 

A 6 digit number begins with the digit 8.The number with divisible by 9 and all digits of the number are different.What is the possible smallest value of this number?

From 4 letters ab18 one can make all 18 numbers with 4 digits. (In a number, each digit is written only once.) The sum of all 18 possible numbers is 90216. Find a and b.

The product of the whole numbers from 1 to 122 is divisible by 22ⁿ. Find the greatest possible value of the whole number n.

 Consider the set of the first one hundred natural numbers {0,1,2,3,…,99}. Let k be the sum  of digits of a number in the set. Find the value of k such that the number of numbers whose digits add up to the same value is a maximum.

Câu 9:
The average mass of a group of children is 47kg. If  of the number of children are girls and their average mass is 39kg. Find the average mass of the boys.
Answer: The average mass of the boys is kg
 

Câu 10:
A 6-digit number begins with the digit 8. The number is divisible by 9 and all digits of the number are different. What is the possible smallest value of this number?
Answer: