Multiple Choice
Write out the sum.
-
A) 12 + 15 + 18 + ... + (3n + 9)
B) 3n + 9
C) 9 +12 + 15 + ... + (3n + 9)
D) 1 + 2 + 3 + ... + n
Correct Answer:
Verified
Correct Answer:
Verified
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