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Let S={(a,b,c) in NN xxNNxxNN : a + b ...

Let `S={(a,b,c) in NN xxNNxxNN` : a + b + c = 21,
`aleblec}and T={(a,b,c)inNNxxNNxxNN` : a, b, c
are in A. P.}, where `NN` is the set of all natural numbers.
Then the number of elements in the set `ScapT` is___

A

6

B

7

C

13

D

14

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