alleryIn an AP, the common difference d is found as:
A$d = a_{n-1} - a_n + 1$
B$d = a_n - a_{n-1}$
C$d = a_n + a_{n-1}$
D$d = a_n \times a_{n-1}$
Answer & Solution
Correct answer: B. $d = a_n - a_{n-1}$
Common difference is the gap between consecutive terms: d = aₙ − aₙ₋₁.
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