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How will the common difference be found from the first two terms of (7,11,15,19,\ldots)?

Answer and explanation

Correct answer: (11-7=4)

The direct answer is option B, \(11-7=4\). In an arithmetic progression, the common difference is found by subtracting the previous term from the next term: \(d=a_2-a_1\). Here the first term is 7 and the second is 11, so \(d=11-7=4\). Checking further gives \(15-11=4\) and \(19-15=4\). Option A reverses the subtraction and gives -4, not the forward common difference. Option B uses the correct order and is correct. Option C adds the terms, but addition does not measure the gap between terms. Option D multiplies them, which is also unrelated to common difference. Memory cue: next term minus previous term.

Related tags

Arithmetic ProgressionApFind Common DifferenceClass Ten

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