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What is 20% of the sum of the first 150 natural numbers?

Answer and explanation

Correct answer: 2265

First calculate the required triangular sum using S_n=n(n+1)/2. For n=150, S_150=150×151/2=75×151=11325. The percentage concept is that 20% equals 20/100, or one-fifth. Thus 20% of the sum is 11325×20/100=11325/5=2265. Therefore option C is correct. It is important not to take 20% of 150 itself, because the question asks for 20% of the complete sum. A second check is 11325×0.2=2265. The other choices do not result from the correct triangular sum and percentage operation; they reflect an arithmetic error or an incorrect interpretation of what quantity the percentage applies to.

Related tags

MathematicsSequencesPercentageSum-Of-Natural-NumbersSum Of First N Natural NumbersSequences And ProgressionsClass 9 Mcq

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