If 15 is the fifth number in a series of 5 consecutive odd number, what is the third number in the series?

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24-12-2017
Mathematics

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If 15 is the fifth number in a series of 5 consecutive odd number, what is the third number in the series?

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ashbea ashbea · Answer 1 · 2017-12-24T07:52:19+01:00

ashbea ashbea

24-12-2017

the five numbers can be represented by (2n+1), (2n+3), (2n+5), (2n+7) and (2n+9) where
n is an integer.
2n+9 = 15
n = 3

The third number is 2n+5 = 11

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AL2006 AL2006 · Answer 2 · 2017-12-24T08:23:10+01:00

AL2006 AL2006

24-12-2017

You really don't have to do hardly ANY work to solve this one.

The fifth of five odd numbers is 15.

So the fourth one is 13.

So the third one is 11.

An I missing something ?

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