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what is the sum of the number 78 to 220?

Guest Mar 30, 2017
 #1
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what is the sum of the number 78 to 220?

 

220 - 78 =142 + 1 =143 Number of terms.

Sum =[F + L] / 2 x N, where F=First term, L=Last term, N=Number of terms.

Sum =[78 + 220] / 2 x 143 =

Sum =[298]/2 x 143 =

Sum = 149 x 143 = 21,307.

Guest Mar 30, 2017
 #2
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Just use the calculator.laugh

Guest Mar 30, 2017
 #3
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thank you!!!!!!!!!!

Guest Mar 30, 2017

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