Computer Science · Oct / Nov 2025 · Paper 2 SL · Question 4
Adapt for 2027The probability and spreadsheet parts are no longer taught; the array simulation algorithms in (d) and (e) can be done in Python or Java.
IBCS
As printed in the paper
The question as text
4. Ten children play a game in which all of them or none of them win a prize. The rules of the game are as follows: y 10 children are assigned a unique number from 0 to 9. y A cupboard contains 10 boxes, each numbered from 0 to 9. y 10 sheets of paper are numbered from 0 to 9. y One piece of paper is put into each box in random order (see Figure 4). Figure 4: 10 boxes, each containing a sheet of paper with a number from 0 to 9 Box 0 1 2 3 4 5 6 7 8 9 Paper 9 8 2 1 7 6 4 3 5 0 Each child is allowed to open 5 boxes to look for their own number. You can assume they will not open the same box twice. Child number 0 goes first and opens 5 of the 10 boxes.
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Show the answer and mark scheme
4(a)(i)[1]
4(a)(ii)[1]
4(b)[1]
4(c)[4]
4(d)[6]
4(e)[4]
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