alleryThe common difference of 3, 7, 11, 15, ... is
A5
B3
C4
D7
Answer & Solution
Correct answer: C. 4
1. Compute the difference between consecutive terms.
2. 7 - 3 = 4.
3. 11 - 7 = 4 and 15 - 11 = 4 confirm.
4. So d = 4.
_Source: Selina Concise Mathematics Class 10, Ch on Arithmetic Progression (Mistral OCR'd PDF), section on common difference_
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