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I just need someone to check my answer: What is the sum of the arithmetic sequence 3, 9, 15..., if there are 24 terms? a) 1452 b) 1728 (my answer) c) 2028 d) 2268
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I just need someone to check my answer: What is the sum of the arithmetic sequence 3, 9, 15..., if there are 24 terms? a) 1452 b) 1728 (my answer) c) 2028 d) 2268
asked
Oct 26, 2018
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I just need someone to check my answer:
What is the sum of the arithmetic sequence 3, 9, 15..., if there are 24 terms?
a) 1452
b) 1728 (my answer)
c) 2028
d) 2268
Mathematics
high-school
Opoe
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Answer:
1728
Explanation:
took the test
Emchristiansen
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Oct 27, 2018
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Emchristiansen
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sum is n(an+a1)/2
an=a1+d(n-1)
common differnce is 6
first term si 3
an=3+6(n-1)
24th term
a24=3+6(24-1)
a24=3+6(23)
a24=3+138
a24=141
so nth term is 141
n=24
24(3+141)/2=12(144)=1728
answer is B
Enigmatic Wang
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Oct 30, 2018
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Enigmatic Wang
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