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Let R = {x|x in N, x is a multiple of 3 ...

Let `R = {x|x in N`, x is a multiple of 3 and `xle100`} `S= {x|x in N`, x is a multiple of 5 and `x le 100`}. What is the number of elements in: `(Rxx S) nn (S xxR)` ?

A

36

B

33

C

20

D

6

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