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If (-4, s, 8, 14) are consecutive terms of an arithmetic progression, what will (s) be?

Answer and explanation

Correct answer: (2)

In an arithmetic progression, every consecutive pair has the same common difference. The given consecutive terms are \(-4,s,8,14\). From 8 to 14, the difference is \(14-8=6\), so the common difference must be 6 throughout the progression. Moving one step backward from 8 means subtracting 6, giving \(s=8-6=2\). Therefore, option B is correct.

This can also be checked from the first terms: \(s-(-4)=s+4\) must equal 6, so \(s=2\). Then the sequence becomes \(-4,2,8,14\), whose consecutive differences are all 6. The value 0 would make the first difference 4, and 4 would make it 8; neither agrees with the difference between 8 and 14. Thus 2 is the only suitable value.

Related tags

ApMissing TermNegative First TermHard

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