## Important Concepts and Formulas - Sequence and Series

Anupam SG 21 Feb 2015 1:28 PM
many many thanks ,by seeing these formulaes now i able to solve each and every question of ap,gp and hp.
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Kryamuna 532 19 Feb 2015 2:47 PM
NO FEAR OF MY EXAM VERY NICE
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Bani Kumar Datta 08 Feb 2015 10:03 AM
Many thanks .I able to solve the problems of A.P & G.P now.
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zubair 28 Jan 2015 9:53 PM
this explanation was cool

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vishal 17 Dec 2014 7:25 PM
Divide 20 into 4 parts which are in A.P. and such that the product of first and fourth is to product of the second and third in ratio 2:3

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Jay 20 Dec 2014 11:15 PM
2,4,6,8  or 8,6,4,2

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Tanika monga 08 Dec 2014 2:26 PM
If (m+n) & (m-n) are in gp & respectively p & q then find the value of m :
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priya 16 Nov 2014 7:13 PM
In how many ways can letters of English alphabet be arranged so that there are 7 letters between the letters a and b and no letter is repeated??
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Raj 21 Nov 2014 12:37 AM
Assuming that all arrangements are done by taking all 26 alphabets at a time

Removing A and B, there are 24 letters. From these letters, 7 alphabets can be arranged between A and B in 24P7 ways

A and B can be arranged in 2! ways

Remaining alphabets = 17
Consider (A)(7 letters)(B) as a single alphabet now
Lets consider this as a total of 18  alphabets . These alphabets can be arranged among themselves in 18! ways

Required number of ways = 24P7* 2! * 18!
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reshma 27 Oct 2014 9:21 AM
what is the formula to find the product of gp
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