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OpenStudy (anonymous):
Hi need help with http://gyazo.com/4b6a6020fc5422bb0935758517f48d90 question 4
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hartnn (hartnn):
u have a20= 43 = a+19 d = 5+19d so 43 =5+19d find d from here, and it will be same as 3rd.
OpenStudy (anonymous):
Can i have the raw formula?
hartnn (hartnn):
raw ?
OpenStudy (anonymous):
The formula you put the numbers into
hartnn (hartnn):
\(\huge a_n=a_1+(n-1)d \\ \huge S_n= (n/2)(2a+(n-1)d)\)
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OpenStudy (anonymous):
thank you soo much <3
hartnn (hartnn):
welcome ^_^
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