A store is having a sale on liquid soap and sponges. The cost of 6 bottles of soap is $9.12. The cost of 4 sponges is $5.00 what
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By the binomial theorem, the term in the expansion of
is
which suggests that the contribution of the binomial coefficient should make up the remaining factor of 21. That is,
Well, we just need to perform the operations:
- Multiplication:
- Subtraction:
- Addition:
- Division:
So, if you add all the numbers together you get
Or, if you prefer,