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? See also our combinations calculator. 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. Elements
    fact_1 If the number of elements is decreased by two the number of permutations is decreased 30 times. How many elements are?
  5. Trinity
    trojka How many different triads can be selected from the group 38 students?
  6. 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?
  7. 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?
  8. Calculation of CN
    color_combinations Calculate: ?
  9. 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?
  10. Equation
    calculator_2 Equation ? has one root x1 = 8. Determine the coefficient b and the second root x2.
  11. Tubes
    pipes_1 Iron tubes in the warehouse are stored in layers so that each tube top layer fit into the gaps of the lower layer. How many layers are needed to deposit 100 tubes if top layer has 9 tubes? How many tubes are in bottom layer of tubes?
  12. Evaluation of expressions
    eq222_10 If a2-3a+1=0, find (i)a2+1/a2 (ii) a3+1/a3
  13. Solve equation
    hrusky_2 solve equation: ?
  14. Algebra
    parabol_3 X+y=5, find xy (find the product of x and y if x+y = 5)
  15. Quadratic equation
    kvadrat_2 Find the roots of the quadratic equation: 3x2-4x + (-4) = 0.
  16. Roots
    parabola Determine the quadratic equation absolute coefficient q, that the equation has a real double root and the root x calculate: ?
  17. Discriminant
    Quadratic_equation_discriminant Determine the discriminant of the equation: ?