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What is the fifth term in the arithmetic progression (140,130,120,110,\ldots)?

Answer and explanation

Correct answer: (100)

The direct answer is option B, 100. In an AP, the common difference remains constant. Here each term is 10 less than the preceding term: 130−140=−10, 120−130=−10, and 110−120=−10. The listed terms are first 140, second 130, third 120, and fourth 110. Therefore the fifth term is 110−10=100. Option A, 90, is the sixth term, not the fifth. Option B, 100, is obtained after one further subtraction and is correct. Option C, 110, is already the fourth term, so it stops one step too early. Option D, 120, is the third term and is even earlier. Always count positions carefully rather than merely continuing until a familiar number appears. Memory cue: for the fifth term, make four moves from the first term: 140−4(10)=100.

Related tags

SequencesProgressionsArithmetic-ProgressionClass-9Easy

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