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In a practice, (1) question is solved on the first day and (38) questions on the (38)th day. If the number increases by (1) daily, how many questions are solved?

Answer and explanation

Correct answer: (741)

Total questions are (S_{38}=\frac{38\times39}{2}=741). A daily increase of (1) forms the sum of natural numbers.

Related tags

MathSequencesNatural-NumbersSumSum Of First N Natural NumbersSequences And ProgressionsMathematicsClass 9 Mcq

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