SOLUTION: 2+4+6....+42
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Question 989971: 2+4+6....+42
Answer by ikleyn(52814) (Show Source): You can put this solution on YOUR website!
.
Arithmetic progression.
First term is 2.
The common difference is 2.
The number of terms is = 21.
Use the formula for the sum (see the lesson Arithmetic progressions in this site)
S = . = . = . = 22*21 = 462.
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