Sum of Integers in an Interval + multiples

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Last updated 4:21 AM on 6/20/26
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6 Terms

1
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Sum of Integers in an Interval: a = first term, l = last term, n = no of integers

sum = (n(a+l)/2)

2
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no of multiples in an interval:

((Last Multiple - First Multiple)/(multiple in question))

3
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No of integers in an interval

Last Number - First Number + 1

4
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mean =

sum/# of multiples

5
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% of vs more

b is 200% of a → b = 2a

b is 300% more than a → b = 3a

6
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Even and odd functions

Even functions: f(-x) = f(x)

Odd functions: f(-x) = -f(x)