# Welcome to Planet Infinity KHMS

## 26 September, 2011

### Sum of first n terms of an A.P. (Problems)

Problem 1 Find the sum of first 50 terms of 7, 3, -1, -5... Problem 2 If the sum of first 6 terms of an A.P. is 126 and its first term is 6, then find the 14th term.

## 25 September, 2011

### Sum of n terms of an A.P. (when first and last term are given)

Let us learn to derive a formula for finding the sum of n terms of an AP when the first term is given and the last term is also known. Consider the general AP a, a+d, a+2d, ...., (a+(n-1)d) Watch this video

## 24 September, 2011

### Formula- sum of first n terms of an AP

Let us learn to derive the formula for sum of first n terms of an A.P a, a+d, a+2d,..., a+(n-1)d. Watch this video

## 22 September, 2011

### Introduction A.P.

Watch this video and learn about a special type of sequence called Arithmetic Progression.

### Number Sequences

First of all understand about number pattern..watch the following video Learn about number sequences...watch the following video

## 07 September, 2011

### Questions for revision- Polynomials Class 9

Questions for revision- Polynomials Class 9

(Visit the link and practice the given questions)

## 06 September, 2011

### Writing firsts 4 terms of AP when a and d are given

When a is the first term and d is the common difference of an A.P. then how to write the terms of A.P.? Watch this video

## 04 September, 2011

### Using formula for nth term of an AP

The sum of 4th and 8th terms of an AP is 24 and the sum of 6th and 10th terms is 44. Find the first three terms of the A.P.