CBSE Class 11-science Answered
a man has 6 friends. In how many ways may he invite one or more of them at dinner?
Asked by | 08 Oct, 2013, 08:54: PM
Expert Answer
The man has to select some or all of his 6 friends. This can be done as follows: The friends may be invited in single, in two's, or in three's, ..., etc.
The number of such selections is C (6, 1) + C (6, 2) + C (6, 3) + C (6, 4) + C (6, 5) + C (6, 6) = 6 +
+
++6+ 1 = 6 + 15 + 20 + 15 + 6 + 1 = 63
+++6+ 1 = 6 + 15 + 20 + 15 + 6 + 1 = 63
Answered by | 09 Oct, 2013, 09:57: AM
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