Answer / guest

The formula to find number of diagonals (D) given total
number of vertices or sides (N) is

N * (N - 3)

D = -----------

2

Using the formula, we get

1325 * 2 = N * (N - 3)

N2 - 3N - 2650 = 0

Solving the quadratic equation, we get N = 53 or -50

It is obvious that answer is 53 as number of vertices can
not be negative.

Alternatively, you can derive the formula as triange has 0
diagonals, quadrangel has 2, pentagon

has 5, hexagon has 9 and so on......

Hence the series is 0, 0, 0, 2, 5, 9, 14, ........ (as
diagram with 1,2 or 3 vertices will have 0

diagonals).

Using the series one can arrive to the formula given above.

if 8men works 8hrs per day for 8days get rs.45,then how many men required if the work is 5hrs per day for 10days they get rs.60?(want solution with steps)

4 Answers   Syntel, Zensar,

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2 Answers  

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3 Answers  

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2 Answers  

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in a village 4000 people watch a tv.in which 1500 watch A channel.2000 watch B channel and 2500 watch C Channel.500 people watch A and B channel.800 watch A and C Channel.1000 watch B and C Cahnnel.find maximum people who watch maximum no of channels?

9 Answers   Siemens,

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3 Answers  

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foot is related to man in the same way hoof is related to...........

0 Answers  

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You have four 9's and you may use any of the (+, -, /, *) as many times as you like. I want to see a mathematical expression which uses the four 9's to = 100 How many such expressions can you make?

1 Answers   Sahara,

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On the shelf you have 10 identical bottles of identical pills (let?s say there?s a hundred pills in each bottle). However, one of those 10 bottles contains cheap knockoff pills. The only way to differentiate fake pills from real pills is the weight - while real pills weigh 1 g each, the knockoff pills are only 0.9 g. You have one scale that shows the exact weight (down to the mg) of whatever is weighed. How can you tell which bottle contains fake pills with just 1 weighing?

7 Answers   Infosys, TCS,

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A fish had a tail as long as its head plus a quarter the lenght of its body. Its body was three-quarters of its total length. Its head was 4 inches long. What was the length of the fish?

2 Answers  

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*suppose u have 2 distribute a sum rs 50 among 30 studnt .it is also decided that a male student will get double than of female student.find the no. of male n female student of class?

4 Answers  

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