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For the AP $5,\ 5,\ 5,\ 5,\ \ldots$ the common difference is
A5
B1
C0
Dundefined
Answer & Solution
Correct answer: C. 0
1. d = second term − first term = 5 − 5 = 0.
2. A common difference of **0** gives a constant AP (all terms equal).
3. d may be positive, negative or zero.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch1 'Arithmetic Progressions' (d can be zero)_
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