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what is the range of n consecutive even positive numbers

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what is the range of n consecutive even positive numbers [#permalink] New post 22 Jan 2005, 20:18
what is the range of n consecutive even positive numbers where n is a +ve integer > 3
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 [#permalink] New post 22 Jan 2005, 21:07
Range = 2(n-1)

suppose, n = 5 even intergers >3
n = 10,12,14,16,18
range = 18-10=8
range = 2(n-1)=2(5-1) = 8

suppose, n = 4 even intergers >3
n = 10,12,14,16
range = 16-10=6
range = 2(n-1)=2(4-1) = 6
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 [#permalink] New post 22 Jan 2005, 21:13
2(n-1)

n > 3....say we have 4 even cons +ve number....n+2, n+4, n+6, n+8 ==> 6
say we have 5 even cons +ve number...range = 8

So we have pattern of 6,8,10

2(n-1)
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 [#permalink] New post 22 Jan 2005, 21:51
If the first number is a, the series is: a a+2 ... a+2(n-1)
So the range is a+2(n-1)-a=2(n-1)
  [#permalink] 22 Jan 2005, 21:51
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