Calculation of CN

Calculate:

$\left({\displaystyle \genfrac{}{}{0px}{}{789}{786}}\right)-\left({\displaystyle \genfrac{}{}{0px}{}{789}{3}}\right)$

Correct answer:

x =  0

Step-by-step explanation:

$\left({\displaystyle \genfrac{}{}{0px}{}{789}{786}}\right)-\left({\displaystyle \genfrac{}{}{0px}{}{789}{3}}\right)={\displaystyle \frac{789!}{786!3!}}-{\displaystyle \frac{789!}{3!786!}}=0$

Try another example

Related math problems and questions:

• Research in school
  For particular research in high school, four pupils are to be selected from a class with 30 pupils. Calculate the number of all possible results of the select and further calculate the number of all possible results, if it depends on the order in which th
• Combinatorics
  The city has 7 fountains. Works only 6. How many options are there that can squirt ?
• Trinity
  How many different triads can be selected from group 38 students?
• Combinations
  If the number of elements increase by 3, it increases the number of combinations of the second class of these elements 5 times. How many are the elements?
• Doctors
  The drug successfully treats 90% of cases. Calculate the probability that he will cure at least 18 patients out of 20?
• Teams
  How many ways can divide 16 players into two teams of 8 member?
• Hockey
  The hockey match ended 8:2. How many different matches could be?
• Examination
  The class is 21 students. How many ways can choose two to examination?
• Count of triangles
  Given a square ABCD and on each side 8 internal points. Determine the number of triangles with vertices at these points.
• Tournament
  Determine how many ways can be chosen two representatives from 34 students to school tournament.
• N-gon
  How many diagonals has convex 11-gon?
• A pizza
  A pizza place offers 14 different toppings. How many different three topping pizzas can you order?
• Combinations
  From how many elements we can create 990 combinations 2nd class without repeating?
• Diagonals
  What x-gon has 54 diagonals?
• Committees
  How many different committees of 2 people can be formed from a class of 21 students?
• Probability of failures
  In certain productions, the probability of failures is 0.01. Calculate the probability that there will be more than one failure among the 100 selected products if we return the selected products to the file after the check.
• Disco
  On the disco goes 12 boys and 15 girls. In how many ways can we select four dancing couples?