Dhamnekar Win,odd Posted March 3, 2022 Share Posted March 3, 2022 Link to comment Share on other sites More sharing options...
Genady Posted March 3, 2022 Share Posted March 3, 2022 I'd think that in a) it's rather n=9 and r=4... The author was right. 1 Link to comment Share on other sites More sharing options...
Dhamnekar Win,odd Posted March 3, 2022 Author Share Posted March 3, 2022 (edited) I have made mistakes in the computations of answers to question (a) and (b). Corrected answer:(a) [math]\binom{n + r -1}{r}= \binom{12}{9}= 220 [/math] where n=9 and r = 4 Corrected answer:(b) [math]220 + \binom{15}{13} + \binom{14}{12} + 2 \times \binom{13}{11} =220 +105 +91 + 156 =572[/math] Hence, author's answers are correct. Edited March 3, 2022 by Dhamnekar Win,odd edited latex to work Link to comment Share on other sites More sharing options...
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