The document Formula's Summary - Sequence and Series CA Foundation Notes | EduRev is a part of the CA Foundation Course Quantitative Aptitude for CA CPT.

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**1. The general term of an A. P. **

a, a + d, a + 2d, ... is given by t_{n} = a + (n â€“1) d

**2. S _{n}, the sum of the first n terms of an A. P.**

a, a + d, a + 2d, ... is given by

**3. A sequence in which the difference of two cousecutive terms is always constant ( â‰ 0) is called an Arithmetic Progression (A. P.)**

**t _{n} = S_{n} â€“ S_{n} â€“ 1**

**4. An arithmetic mean between a and b is (a + b)/2**

**5. A sequence in which the ratio of two consecutive terms is always constant ( â‰ 0) is called a Geometric Progression (G. P.)**

**6. The nth term of a G.P.: a, ar, ar ^{2}, ... is ar^{n â€“ 1}**

**7. Sum of the first n terms of a G. P.: a, ar, ar ^{2}, ... is**

**8. The sums of an infintite G. P. a, ar, ar ^{2}, ... is given by**

**9. Geometric mean G between two numbers a and b is âˆšab**

**10. The arithmetic mean A between two numbers a and b is always greater than the corresponding Geometric mean G i.e., A > G.**

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