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What is the (28)th term of the AP (4,11,18,\ldots)?

Answer and explanation

Correct answer: (193)

The direct answer is option B, 193. In an arithmetic progression, a is the first term and d is the fixed increase. Here a=4 and d=11-4=7. To reach the 28th term, we make 27 equal jumps, because the first term needs zero jumps. Thus a_28=a+27d=4+27(7)=4+189=193. Option A, 190, is too small and does not follow the sequence. Option B, 193, is exactly the calculated 28th term. Option C, 196, would result from adding one extra jump, effectively using 28d instead of 27d. Option D, 199, is even farther away and also uses too many increases. Another check is that the sequence is 4, 11, 18, and every step adds 7; after 27 steps the result is 193. Exam cue: the term number is not the number of differences; subtract one first.

Related tags

ApNth-TermMediumClass10

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