+0  
 
0
231
1
avatar+201 

Use the formula S​ = n2 to find the sum of 1​ + 3​ + 5​ + ...​ +

861 = . ​(Hint: To find​ n, add 1 to the last term and divide by​ 2.)

cassie19  Sep 6, 2017
 #1
avatar+19835 
+1

Use the formula S​ = n2 to find the sum of

1​ + 3​ + 5​ + ...​ + 861 = ?

​(Hint: To find​ n, add 1 to the last term and divide by​ 2.)

 

\(\begin{array}{|rcll|} \hline n &=& \frac{861+1}{2} \\ &=& \frac{862}{2} \\ &=& 431 \\ \hline \end{array} \)

 

\(\begin{array}{rcll} sum &=& n^2 \\ &=& 431^2 \\ &=& 185761 \\ \end{array}\)

 

\(\begin{array}{rcll} 1\ + 3\ + 5\ + 7\ + \ ... \ + 859\ + 861 &=& 185761 \\ \end{array}\)

 

laugh

heureka  Sep 6, 2017
edited by heureka  Sep 6, 2017

9 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.