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What is the tenth term of the arithmetic progression (11,22,33,44,\ldots)?

Answer and explanation

Correct answer: (110)

The direct answer is option B, 110. The sequence is 11, 22, 33, 44, and so on. Each term increases by 11: 22−11=11, 33−22=11, and 44−33=11. It is also the sequence of positive multiples of 11. The nth term is therefore 11n, so the tenth term is 11×10=110. Option A, 99, is 11×9 and is the ninth term, so it is one position early. Option B, 110, is 11×10 and is correct. Option C, 121, is 11×11, the eleventh term, so it is one position late. Option D, 132, is 11×12, the twelfth term, and is also too large. The important point is to multiply 11 by the term number, not by a number chosen from the displayed list. Memory cue: in 11, 22, 33, the nth term is 11n.

Related tags

SequencesProgressionsArithmetic-ProgressionClass-9Easy

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