Question 1201548
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if P(n,2) = 110, find n.
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<pre>
The P(n,2) formula is

    P(n,2) = n*(n-1).


They want you find n from equation

    n*(n-1) = 110.        (1)


At this point, you can guess the solution for (1) mentally (n=11),
since you have the product of two consecutive integers in left side.


Alternatively, you can write it in the standard form quadratic equation

    n^2 - n - 110 = 0     (2)


and solve it by factoring left side

    (n-11)*(n+10) = 0,

or you can solve it using the quadratic formula.


In any way, you will obtain the same 


<U>ANSWER</U>.  n = 11.
</pre>

Solved.