An eighth remains.
75
8
You find the sample space by enumerating all of the possible outcomes. The sample space for three coins is [TTT, TTH, THT, THH, HTT, HTH, HHT, HHH].
The sample space when tossing a coin three times is [HHH, HHT, HTH, HTT, THH, THT, TTH, TTT]It does not matter if you toss one coin three times or three coins one time. The outcome is the same.
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The fraction that remains is 1/8.
1/8 of the original amount remains.
It is 1/8 .
Not sure what you mean by "had-lives". After 3 half lives, approx 1/8 would remain.
Approx 1/8 will remain.
There are three models of a fraction namely area model, liner model and set model.
If I take a radioactive sample of 400 moles of an unknown substance and let it decay to the point of three half-lives I would have 50 moles left of the sample. 1/2 of what is left will decay in the next half-life. At the end of that half-life I will have 25 moles left of the unknown substance or 4/25.
It will take two half-lives or about 60.34 years for three-fourths of a Cs-137 sample to decay.
Not sure what you mean by "had-lives". After 3 half lives, approx 1/8 would remain.
91.16% of the daughter product has formed after 3.5 half lives.
75
5/12 of the pizza remains.