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In the arithmetic progression (3,10,17,24,\ldots), which term is (38)?

Answer and explanation

Correct answer: (6)th term

An arithmetic progression changes by the same amount from one term to the next. Here, each term increases by 7: from 3 to 10, from 10 to 17, and from 17 to 24. Therefore, the terms can be continued by adding 7 each time. The question asks for the position of 38, not merely whether 38 belongs to the progression.

Starting with the first term, the sequence is 3, 10, 17, 24, 31, 38. Counting carefully, 3 is the first term, 10 the second, 17 the third, 24 the fourth, 31 the fifth, and 38 the sixth. The formula gives the same result: using the first term and common difference, solve \(3+(n-1)7=38\), so \(n-1=5\) and \(n=6\). Hence, option C is correct. Option B stops at 31, while option D would be 45.

Related tags

SequencesProgressionsArithmetic-ProgressionClass-9EasyArithmetic ProgressionSequences And ProgressionsMathematics

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