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anonymous
 one year ago
can someone please help me... I need to pass math.
what is the sum of the series?
A. 220
B. 110
C. 95
D. 110
anonymous
 one year ago
can someone please help me... I need to pass math. what is the sum of the series? A. 220 B. 110 C. 95 D. 110

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\sum_{n1}^{20} (51)\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0that 1 in the parenthesis is supposed to be an n

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I did the equation but when I add all the number up I get a weird number not one that i need.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0That's an arithmetic sequence because it's linear. You can use this formula dw:1435279685117:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\sum_{n=1}^{20} (5n)\]?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I tried this but when I add the numbers I don't get the answer that i need... Could you help further on please.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0you can do @peachpi way or you can break it in two \[\sum_{n=1}^{50}5\sum_{n=1}^{20}n\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oops \[\sum_{n=1}^{20}5\sum_{n=1}^{20}n\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I did 5 1 1 5  2  1 5  3  1 and so on

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the first summation is \(20\times 5\) and for the second one it is \[\frac{20\times 21}{2}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0use @peachpi formula, you do not want to add up twenty numbers

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@peachpi can you write you formula out I dont really understand it

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0your formula is 5 n. The sum goes from 1 to 20, so plug them in. What do you get when you sub in 1 for n? What do you get when you sub in 20 for n?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.05  1 = 4 5  20 = 15

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1435280659076:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\frac{20}{2}\neq 5\]
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