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Fun math question help?
I don't understand how to do this, any help?
Friday Problem: Consider all possible combinations of 3 coins using only pennies, nickels, dimes, and quarters. The total value of these combinations exceeds $6.00 by k cents. What is the value of k?
2 Answers
- PrashantLv 69 years agoFavorite Answer
Total no. of combinations = C(6,3) = 20
(This is a standard combinatorial problem: do a case analysis, or use some formula).
So, the total no. of coins involved in these combinations = 20*3
No. of coins of each denomination = 60 /4
(By symmetry, we must have no. of dimes = no. of pennies = ...)
So,
the total value = 15 * (0.01 + 0.05 + 0.10 + 0.25) = 6.15
So k=15
Hope this helps.
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- Anonymous7 years ago
tricky stuff do a search from google or bing it might help
