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Question

A man driving a car in such a way that the car covers n kms in nth second. Find the total distance travelled by the car for 40 seconds (in km)


A

40

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B

820

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C

800

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D

810

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Solution

The correct option is B

820


The distance covered by the car in each second will be in A.P. with common difference 1.

So the sum is = 40(40+1)2=40412=820 kms


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