Algebra/Stat&Prob/Const

sum of the roots of a quadratic equation

-B/A

product of the roots of a quadratic equation

C/A

rth term in the expansion of (a+b)ⁿ

where m = r-1

sum of the first n terms for a geometric progression

nth term of a geometric progression

nth term of an arithmetic progression

sum of the first n terms of an arithmetic progression

sum of the first n terms of an infinite geometric progression

nth term of a harmonic progression

sum of the first n terms in a harmonic progression

Geometric Mean, GM

Harmonic Mean

Relationship between AM, HM, and GM

AM x HM = GM²

Permutation

Cyclic Permutation

Combination