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Re: What is the sum of odd integers from 35 to 85, inclusive? A [#permalink]
Sum of Consecutive integers formula:

1- Quantity of numbers: (Largest num - smallest num)/2 + 1
(85 - 35)/2 + 1 = 26

2- Average of numbers: (Largest num + smallest num)/2
(85 + 35)/2 = 60

3- Sum of numbers: Quantity * Average
Sum = 26 * 60
Sum = 1560 - Option A
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Re: What is the sum of odd integers from 35 to 85, inclusive? A [#permalink]
The quantity of the number will be 85-35/2 =25+1=26

The we can find the sum of the integer with AP formula
Which is An=n/2(2a+(n-1)d)
Where n=26, a=35 and d=2

13(2*35+(25)2) =1560 A

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Re: What is the sum of odd integers from 35 to 85, inclusive? A [#permalink]
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Re: What is the sum of odd integers from 35 to 85, inclusive? A [#permalink]
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