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anonymous
 5 years ago
A partial sum of an arithmetic sequence is given. Find the sum.
4 + 9 + 14 + . . . + 484 need help
anonymous
 5 years ago
A partial sum of an arithmetic sequence is given. Find the sum. 4 + 9 + 14 + . . . + 484 need help

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0The sum forumla you may find useful is \[S_n = \frac{1}{2} \cdot n(a+l) \] You just need to find the number of terms...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0(Where a = first term, l = last term, n = number)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Hint: The nth term = (n1)d, so 484 = (n1)*4 => n1 = 484/4

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so n is 121. because 484/4= 121

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0No sorry I misread it, see the post below.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0a+(n1)d =>484 = 4 + (n1)*5
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