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Clairetdiapanago
Answered

What is the sum of all the even integers between 11 And 31?



Please give me answer​

Sagot :

2017E0010go

Answer:

n(n+1)

Step-by-step explanation:

Sn = ½ n[2.2+(n-1)2]

Sn = n/2[4+2n-2]

Sn = n/2[2+2n]

Sn = n(n+1)

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