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If (5,11,n,23) are consecutive terms of an arithmetic progression, what is (n)?

Answer and explanation

Correct answer: (17)

For consecutive terms of an arithmetic progression, the difference between adjacent terms is constant. From the first two terms, the common difference is \(d=11-5=6\). Add this difference to the second term to obtain the third term: \(n=11+6=17\). Adding 6 once more gives \(17+6=23\), matching the fourth term and confirming the calculation.

Therefore \(n=17\), so option C is correct. The sequence is \(5,11,17,23\), and each term increases by 6. Values such as 15 or 16 would make the differences unequal, while 18 would produce a third-to-fourth difference of only 5. Hence only 17 satisfies the arithmetic-progression condition.

Related tags

ApMissing TermConsecutive TermsMedium

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