Combinatorics

nPr = n! / (n − r)!. nCr = nPr / r!. n and r are whole numbers, 0 ≤ r ≤ n ≤ 170. Order matters in a permutation and does not in a combination.

Combinations nCr

120

Permutations nPr

720

3,628,800

10 choose 3 is 120. Beyond 170! JavaScript’s Number overflows to Infinity, so the page stops.

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Greatest common divisor and least common multiple of two integers.

log_base(x), plus the natural log and the common log.

What is x percent of y, what percent is a of b, and the percentage change from A to B.

How much a figure moved, as a percent of the starting value.

Sine, cosine and tangent of an angle in degrees, plus the radian.

Fill two sides of a right triangle; the third and the area come out.