Tác giả: admin

How many 3-digit numbers divisible by 5 can be formed by using digits 0, 1, 2, 4, 5 without repetition?…

Given 10 points such that no 3 points are collinear. How many line segments can be counted in the figure…

John tosses a fair dice with 6 faces three times. In how many cases does the product of 3 faces…

In how many ways can we arrange 5 students and 1 teacher to form a line given that the teacher…

A box contains 100 marbles in 3 colors: red, blue and yellow. There are 20 red marbles and 50 blue…