FORMULAS

• Formula for computing for Arithmetic Sequences:

  (Note:

  Write subscript like aₙ as [an]. For example, a₅ we write it as a5.

  For Fractions, instead of writing ½, write 1/2 instead.

  For Exponents, we use [^]. For example, a⁴ can be written as a^4.)

  
  

  an = a1 + (n-1)d
• Formula for Arithmetic Series:

  (Note:

  Write subscript like aₙ as [an]. For example, a₅ we write it as a5.

  For Fractions, instead of writing ½, write 1/2 instead.

  For Exponents, we use [^]. For example, a⁴ can be written as a^4.)

  
  

  Sn = n/2(a1 + an)
• Formula for Geometric Sequences:

  (Note:

  Write subscript like aₙ as [an]. For example, a₅ we write it as a5.

  For Fractions, instead of writing ½, write 1/2 instead.

  For Exponents, we use [^]. For example, a⁴ can be written as a^4.)

  an = a1(r^n-1)
• Formula for Finite Geometric Series:

  (Note:

  Write subscript like aₙ as [an]. For example, a₅ we write it as a5.

  For Fractions, instead of writing ½, write 1/2 instead.

  For Exponents, we use [^]. For example, a⁴ can be written as a^4.)

  
  

  Sn = a1(1-r^n)/1-r
• Formula for Infinite Geometric Series:

  (Note:

  Write subscript like aₙ as [an]. For example, a₅ we write it as a5.

  For Fractions, instead of writing ½, write 1/2 instead.

  For Exponents, we use [^]. For example, a⁴ can be written as a^4.)

  a∞ = a1/1-r
• Formula for computing for Fibonacchi Sequences:

  (Note:

  Write subscript like aₙ as [an]. For example, a₅ we write it as a5.

  For Fractions, instead of writing ½, write 1/2 instead.

  For Exponents, we use [^]. For example, a⁴ can be written as a^4.)

  Fn = Fn-2 + Fn-1