3 + 6 + 9 + 12 + ... + 999
<span>= 3(1 + 2 + 3 + 4 + ... + 333) </span>
<span>= 3(Summation of r from 1 to 333) </span>
<span>= 3((1 + 333)(333/2)) </span>
<span>= 3(334)(333/2) </span>
<span>= 3(167)(333) </span>
<span>= 166833 </span>
<span>Edit: Opps, I forgot that you ask about an equation. </span>
<span>The sum of 1 + 2 + 3 + 4 + ... + n, where n is some integer, is: </span>
<span>(First term + Last term) multiplied by (Total number of terms / 2) </span>
<span>= (1 + n)(n / 2)</span>
Answer:
I see 3 triangles.
Step-by-step explanation:
Answer:
100a^2b^2
Step-by-step explanation:
square -10, a and b just get squared seperately
Answer:
5:2
Step-by-step explanation:
Ratio = Gold pieces : Silver pieces
We have 20 gold pieces
8 silver pieces
Ratio = 20 : 8
Dividing through by 4
= 5 : 2
Therefore, the correct ratio = 5:2