# Quadratic equation + combinatorial number - math problems

#### Number of problems found: 8

• 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?
• Diagonals
What x-gon has 54 diagonals?
• Combinations
From how many elements we can create 990 combinations 2nd class without repeating?
• Combinations
How many elements can form six times more combinations fourth class than combination of the second class?
• 2nd class combinations
From how many elements you can create 4560 combinations of the second class?
• VCP equation
Solve the following equation with variations, combinations and permutations: 4 V(2,x)-3 C(2,x+ 1) - x P(2) = 0
• Party
At the party everyone clink with everyone. Together, they clink 406 times. How many people were at the party?
• Points in space
There are n points, of which no three lie on one line and no four lies on one plane. How many planes can be guided by these points? How many planes are there if there are five times more than the given points?

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