Permutations And Combinations Question 146
Question: The total number of ways of selecting six coins out of 20 one rupee coins, 10 fifty paise coins and 7 twenty five paise coins is
Options:
A) 28
B) 56
C) $ ^{37}C_6 $
D) None of these
Correct Answer: A 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{r}=28 $ .
Show Answer
Answer:
Solution:
BETA
