Variations 26791

If the number of elements increases by two, the number of variations of the second class of these elements created by 38 increases. What is the original number of elements?

Correct answer:

n =  9

Step-by-step explanation:

 n (n1) + 38 = (n+2) (n+21)  4n+36=0  4 n+36=0  4n=36  n=436=9  n=9

Did you find an error or inaccuracy? Feel free to write us. Thank you!

Tips for related online calculators
Are you looking for help with calculating roots of a quadratic equation?
See also our variations calculator.
Do you have a linear equation or system of equations and are looking for its solution? Or do you have a quadratic equation?
Would you like to compute the count of combinations?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions: