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2611.1. Variation, combination

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In the recommended literature list there are 6 books. If you decided to read them all, in how many different sequences could you read them?

The fact that books have to be read, you remember only a week before the school starts un understand, that you can manage to read only 3, in how many different sequences could you read any 3 of them?
Grade:
9
Subject
Algebra
Theme
Combinatorics, probability theory elements
Subtheme
Variation, combination

Solve tasks to find hidden Geo point coordinates

  1. Algebra: Quotient
  2. Algebra: Variation, combination
  3. Physics: Electrosafety.
  4. Algebra: Equation with two unknowns (either 1 or 2 degree)
  5. Geometry: peak, edge, face, prism (straight and regular) pyramid (also regular), cylinder, cone, sphere.
  6. Algebra: Numerical chain concept
  7. Algebra: Arithmetic progression
  8. Algebra: Variation, combination
  9. Physics: Elements in suns system.
  10. Algebra: Probability
  11. Chemistry: Obtaining metal from oxides. With chemical reaction equations.
  12. Algebra: Inequality systems
  13. Geometry: Triangle, parallelogram, diamond area formulas, through narrow angle sine value.
  14. Algebra: Difference
  15. Algebra: Fraction inequalities
  16. Chemistry: Metal chemical properties.
  17. Algebra: Quadratic function y = ax² + bx + c concept
  18. Algebra: Quadratic function y = ax² + bx + c concept
  19. Algebra: Variation, combination
  20. Geometry: Triangle similarity signs.
  21. Algebra: Interval methodes in inequalities
  22. Chemistry: Organic substance transformation.
  23. Algebra: Difference
  24. Geometry: peak, edge, face, prism (straight and regular) pyramid (also regular), cylinder, cone, sphere.
  25. Chemistry: Hydrocarbon combustion. Calculations with chemical reaction equations.
  26. Physics: Electromagnetic waves in nature
  27. Geometry:
  28. Algebra: Interval methodes in inequalities
  29. Geometry: peak, edge, face, prism (straight and regular) pyramid (also regular), cylinder, cone, sphere.
  30. Algebra: Quadratic function y = ax² + bx + c concept
  31. Algebra: Equivalence
  32. Algebra: Combinatorics
  33. Physics: The development of transport
  34. Algebra: Function concept recess: growth-decrease; biggest-smallest value;value interval.
  35. Geometry: Regular polygon, perimeter and area. Regular polygon indrawn circle, regular polygon indrawn in a circle.
  36. Algebra: Combinatorics
  37. Physics: Energy usage in everyday life
  38. Physics: Electrical circuit characteristics and Ohms law in circuit.
  39. Algebra: Function concept recess: Function root; growth-decrease; biggest-smallest value; value interval.
  40. Chemistry: Calculations by chemical reactions.
  41. Algebra: Difference
  42. Algebra: Function concept recess: growth-decrease; biggest-smallest value;value interval.