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Question

The sum of all natural numbers less than 500 which are not divisible by 7 is

A
17,892
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B
124,750
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C
106,858
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D
107,358
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Solution

The correct option is D 107,358
Natural no.'s less than 500 not divisible by 7
Total =[5007]=71
Greatest integer function
Sum =(1+2+3+....500)(7+14+21....497)
Sum =500(501)27(1+2+......71)
Sum =250(501)7×71(72)2
Sum =12525017892
Sum =107358
D is correct.

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