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?

Result

n =  3

Solution:

Solution in text n =
Solution in text n = : Nr. 1

Checkout calculation with our calculator of quadratic equations.








Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!
avatar




Looking for help with calculating roots of a quadratic equation? Would you like to compute count of combinations? Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

Next similar examples:

  1. Combinations
    trezor_1 How many elements can form six times more combinations fourth class than combination of the second class?
  2. 2nd class combinations
    color_circle From how many elements you can create 4560 combinations of the second class?
  3. Combinations
    math_2 From how many elements we can create 990 combinations 2nd class without repeating?
  4. Calculation of CN
    color_combinations Calculate: ?
  5. The confectionery
    ice_cream The confectionery sold 5 kinds of ice cream. In how many ways can I buy 3 kinds if order of ice creams does not matter?
  6. Trinity
    trojka How many different triads can be selected from the group 43 students?
  7. Theorem prove
    thales_1 We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
  8. Fish tank
    zebra_fish A fish tank at a pet store has 8 zebra fish. In how many different ways can George choose 2 zebra fish to buy?
  9. Equation
    calculator_2 Equation ? has one root x1 = 8. Determine the coefficient b and the second root x2.
  10. Quadratic equation
    kvadrat_2 Find the roots of the quadratic equation: 3x2-4x + (-4) = 0.
  11. Square root 2
    parabola_2 If the square root of 3m2 +22 and -x = 0, and x=7, what is m?
  12. Evaluation of expressions
    eq222_10 If a2-3a+1=0, find (i)a2+1/a2 (ii) a3+1/a3
  13. Discriminant
    Quadratic_equation_discriminant Determine the discriminant of the equation: ?
  14. Roots
    parabola Determine the quadratic equation absolute coefficient q, that the equation has a real double root and the root x calculate: ?
  15. Solve 3
    eq2_4 Solve quadratic equation: (6n+1) (4n-1) = 3n2
  16. Solve equation
    hrusky_2 solve equation: ?
  17. Quadratic inequation
    eq2_8 If 5x + x² > 100, then x is not