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If S1={1,2,3,…, 20}, S2={a,b,c,d}, S3={b...

If `S_1`={1,2,3,…, 20}, `S_2`={a,b,c,d}, `S_3`={b,d,e,f}. The number of elements of : `(S_1 xx S_2) uu (S_1 xx S_3)` is :

A

100

B

120

C

140

D

40

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The correct Answer is:
B
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