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The number of ordered triplets (a, b, c)...

The number of ordered triplets `(a, b, c)` such that `L.C.M.(a, b) = 1000, L.C.M. (b,c) = 2000 and L.C.M. (c,a) = 2000`

A

70

B

80

C

90

D

None of these

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