A) 28
B) 56
C) \[^{37}{{C}_{6}}\]
D) None of these
Correct Answer: A
Solution :
Since the total number of selections of \[r\] things from \[n\] things where each thing can be repeated as many times as one can, is\[^{n+r-1}{{C}_{r}}\]. Therefore the required number\[{{=}^{3+6-1}}{{C}_{6}}=28\].
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