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Question

The value of 21/2.31/3.41/4101/5.53/5÷34/3.57/543/5.6 is


A

6

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B

10

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C

15

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D

30

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Solution

The correct option is B

10


The given expression

21/2.31/3.(2)21/4(2×5)1/5.53/5×(22)3/5×2×334/3×57/5=2(12+12).31/321/5×5(3515)×26/5×2×334/3×57/5=2(1+1/56/5+1)×3(13+143)×5(7525)=21×30×51=10.


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