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Is the sum of the integers from 54 to 153 inclusive, divisib

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Is the sum of the integers from 54 to 153 inclusive, divisib [#permalink]

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Is the sum of the integers from 54 to 153 inclusive, divisible by 100?

Hint: Can be solved fast with a property.
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Re: Is the sum of the integers from 54 to 153 inclusive.... [#permalink]

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Re: Is the sum of the integers from 54 to 153 inclusive.... [#permalink]

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jlgdr wrote:
Is the sum of the integers from 54 to 153 inclusive, divisible by 100?

Hint: Can be solved fast with a property.


My other approach :)

Sum of 1 to 153, inclusive = [(1+153)/2] x 153 = 77 x 153
Sum of 1 to 53, inclusive = [(1+53)/2] x 53 = 27 x 153

Sum of 54 to 153, inclusive = 77*153 - 27*53
= 77*100 + 77*53 - 27*53
= 77*100 + 53*(77-27)
= 77*100 + 53*50

Only 77*100 is divisible by 100

==> The ans is: NOT divisible by 100

Hope it helps.
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Re: Is the sum of the integers from 54 to 153 inclusive.... [#permalink]

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Also by Property:

For any set of consecutive integers with an EVEN number of items, the sum of all the items is NEVER a multiple of the number of items.
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Re: Is the sum of the integers from 54 to 153 inclusive.... [#permalink]

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jlgdr wrote:
Also by Property:

For any set of consecutive integers with an EVEN number of items, the sum of all the items is NEVER a multiple of the number of items.


Correct.

Properties of consecutive integers:
• If n is odd, the sum of n consecutive integers is always divisible by n. Given \(\{9,10,11\}\), we have \(n=3=odd\) consecutive integers. The sum is 9+10+11=30, which is divisible by 3.
• If n is even, the sum of n consecutive integers is never divisible by n. Given \(\{9,10,11,12\}\), we have \(n=4=even\) consecutive integers. The sum is 9+10+11+12=42, which is NOT divisible by 4.

For more check here: math-number-theory-88376.html
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Re: Is the sum of the integers from 54 to 153 inclusive, divisib [#permalink]

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Re: Is the sum of the integers from 54 to 153 inclusive, divisib [#permalink]

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New post 16 Dec 2016, 18:03
Great Question.
I actually calculated the sum without looking for the property.

Also to add to the properties =>
Mean of n consecutives can be of the form x or x.5 (for any integer x)

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Re: Is the sum of the integers from 54 to 153 inclusive, divisib   [#permalink] 16 Dec 2016, 18:03
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Is the sum of the integers from 54 to 153 inclusive, divisib

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