The product of all positive integers up to n, written as n! (e.g., 5! = 5×4×3×2×1 = 120).
The factorial of a non-negative integer n is the product n × (n−1) × (n−2) × ... × 1. By convention, 0! = 1.
1!=1, 2!=2, 3!=6, 4!=24, 5!=120, 6!=720, 7!=5040, 10!=3,628,800, 20!=2.43×10¹⁸
A number expressed as a fraction of 100, used to describe proportions and rates of change.
A measure of the spread or dispersion of a data set from its mean (average).
Three measures of central tendency used to describe the center of a data set.
A fundamental relation in geometry: the square of the hypotenuse equals the sum of squares of the other two sides.
Area measures the surface inside a shape (in square units); perimeter measures the distance around it.
A number representing a part of a whole, written as a numerator over a denominator.