MATH FORMULA

• Arithmetic Sequence, means and Harmonic Sequence: an=a1+(n-1)d
• Arithmetic Series (Given a1, n, an)

  : Sn=n/2(a1+an)
• Arithmetic Series (Given a1, n, d): Sn=n/2[2a1+(n-1)(d)]
• Geometric Sequence and Means: an=a1r^(n-1)
• Geometric Series if r is not equal to 1: Sn=a1(r^n-1)/r-1
• Geometric Series if r is equal to 1:

  Sn=na1
• Geometric Series if r is equal to -1 and n is even: 0
• Geometric Series if r is equal to -1 and odd: a1
• Fibonacci Series: Sn=-a2+a n+2
• Infinite Geometric Sequence: Sn=a1/1-r