- Ad
- B3d
- C2d
- D4d
Step-by-Step Solution
(a − d) − (a − 3d) = 2d, and the same for each pair of neighbours. So the common difference is 2d, not d.
Answer: C) 2d
Four numbers in AP are written as a − 3d, a − d, a + d, a + 3d. What is their common difference?
Class 10Properties and Selection of AP TermsAlgebra — Sequences
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