## Friday, May 3, 2013

### 58-08 Basics of Arithmetic & Geometric Progression (Grades 9 to 12) Part-08

Blog-58

Dear Students,

Following two files are very important to improve your base for remembering the formulas. It is 100 % free for all the students of the world. Download these two files, take the Print Out of these files on two sides of the paper and practice these formulas for your benefit to get high scores in Mathematics Standard 10/ Grade 10.

#### Example:

A) If s4  =  156 and s8  =  97656, the find a and r.

Solution:
1) Let " a " be the 1st tern and " r " be the common ratio. So we have,
6) Answer: We have a = 1 when r = 5 and a = -3/2 when r = - 5

Note: Here the division of 97656 by 156 is complicated as we should not use the calculator. Please see the following simple method of calculation so that you will save lot of time and you can't make any calculation mistake. In the following method you may observe that there are few more steps are to be done but all these steps are simply to understand the calculation. You may also notice that these calculation process is really very simple. So we will solve the same problem with another Simple Method.

Solution:
1) Let " a " be the 1st tern and " r " be the common ratio. So we have,

6) Answer: We have a = 1 when r = 5 and a = -3/2 when r = - 5

Some more Problems with Simple Method of calculations will be published in the Next Blog.

Anil Satpute