Numbers Game Help
Help Level 4d
Factorials
Learn to Play the Numbers Game Level Four
n! Factorial Symbol
The factorial symbol for the game, above, multiplies a series of numbers,
starting with the number 1.
In most mathematical equations factorial is just represented as a
digit followed by an
exclamation point, !.
However the numbers game wants you to find a digit to represent
n, in the symbol above.
Select a digit, then select the factorial n! symbol. The digit you select substitutes for n.
For example, assume you select 3 then
the n! symbol.
The factorial of 3 equals 6
because 1 * 2 * 3 = 6.
Example
Assume the following question displays below the landscape.
Form an expression which evaluates to 2.
To find the correct answer
select 2, then tap the n!
symbol.
The expression
1 * 2 evaluates to 2
because 1 * 2 = 2.
Your score increases by forty points.
However other correct expressions might exist in the game.
The factorial symbol provides very rapid increases in value.
For example the factorial of 7 equals 5040.
Cheat Sheet for Factorial
The domain for the Numbers Game
level four
is {1,2,3,4,5,6,7}.
The range for factorial n! follows.
{
1x1,
1x2,
1x2x3,
1x2x3x4,
1x2x3x4x5,
1x2x3x4x5x6,
1x2x3x4x5x6x7
}
The result equals {1,2,6,24,120,720,5040}.
Therefore factorial n! calculates to
one of seven values from the set {1,2,6,24,120,720,5040},
in level four of the Numbers Game
.
Help with Sigma Sum a Series
For details regarding summation see Sum a Series.
