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Question

If the sum of first 10 natural numbers is S1  and that of first 10 whole numbers is S2 . Then S1S2  is



A

20

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B

10

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C

30

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D

40

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Solution

The correct option is C

10


The sets of natural and whole numbers are (1,2,3,4,5...) and (0,1,2,3...)

 S1=n2(2a+(n1)d)=5(2+9)=55 and
S2=5((2×0)+9)=45
S1S2=5545=10


Mathematics

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