Sum of an arithmetic series Watch

Hellospaceboyy
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#1
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How would you work out the sum of this series?

5+7+9....+75
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TenOfThem
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(Original post by Hellospaceboyy)
How would you work out the sum of this series?

5+7+9....+75
I would use the rule 1/2 (first+last)(number of terms)
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brianeverit
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(Original post by Hellospaceboyy)
How would you work out the sum of this series?

5+7+9....+75
Taking 75 as the nth term, use the formula for the nth term to find the number of terms, then use the formula for the sum.
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