A) \[10\,!\]
B) \[{{2}^{10}}\]
C) \[10\,!\,-\,1\]
D) \[{{2}^{10}}-1\]
Correct Answer: D
Solution :
Required number of ways = \[{{2}^{10}}\] - 1 (Since the case that no friend be invited i.e., \[^{10}{{C}_{0}}\] is excluded).
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