For a given arithmetic sequence, and . Find
a) the common difference.
b) .
Answers: a) -1, b) 0
Could someone explain to me the method?
Hello, shawli!
You typed part (b) incorrectly . . .
The term is given by: . . where: .For a given arithmetic sequence: .
Find: .
. . . . .
Answers: .
We have: .
Equate [1] and [2]: .
. . . . . .
If , we have: .
. . and the arithmetic sequence cannot be determined.
If , then: .
. . . .
Since , we have: .