Answer:
d. [tex]\displaystyle 210[/tex]
Explanation:
The keywords how many ways, signal combinations, especially since order does not matter, so we use the combination formula:
[tex]\displaystyle \frac{n!}{[-r + n]!r!} =\: _nC_r \\ \\ \frac{10!}{[-6 + 10]![6!]} = \frac{3628800}{[4!][6!]} = \frac{3628800}{[24][720]} = \frac{3628800}{17280} = 210[/tex]
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