Question

What is the common difference for this arithmetic sequence?
45, 39, 33, 27, 21, .
O A. 45
OB. 6
OC. 39
OD. -6

Answer 1

Answer:

Concept: Series

1. Start by taking the first and second An and finding the difference
2. You can then prove your result by taking any ordinary An and subtracting it by An-1
3. Hence 45-39= 6
4. To prove our result of 6; 39-33= 6
5. Hence the common difference is
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