# Timothy Gan

### 2022 HCI P2 Q11

2022 HCI P2 Q11 A cafeteria installed a vending machine which dispenses two types of coffee into disposable cups as follows: (I) Black coffee, $X$ ml, normally distributed with mean

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### N1987 P1 Q18 [Modified]

These Ten-Year-Series (TYS) worked solutions with video explanations for 1987 A Level H2 Mathematics Paper 2 Question 18 [Modified] are suggested by Mr Gan. For any comments or suggestions please

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### 2020 HCI P2 Q8

2020 HCI P2 Q8 A set of $9$ cards are numbered $1$, $1$, $2$,$3$, $3$, $4$, $5$, $5$ and $6$. A round of matching game is played where two cards

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### 2020 HCI P2 Q7

2020 HCI P2 Q7 A team of $15$ students was selected for an outdoor education trip. One student volunteered to be the trip leader while another volunteered as the assistant

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### 2022 DHS P2 Q11

2022 DHS P2 Q11 Emma has a computer program that generates a random positive integer $X$. The probability distribution of $X$ is: $text{P}left( X=r right)=frac{a}{{{r}^{3}}}$, $rin {{mathbb{Z}}^{+}}$ and $a$ is

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### 2017 AJC Promo Q8

2017 AJC Promo Q8 In order to construct a temporary shelter, three vertical poles $OP$, $AQ$ and $BR$ of heights $6$m, $8$m and $10$m respectively are planted firmly their bases

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### 2017 IJC P2 Q6

2017 IJC P2 Q6 Seven red counters and two blue counters are placed in a bag. All the counters are indistinguishable except for their colours. Clark and Kara take turns

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### 2022 SAJC P2 Q8

2022 SAJC P2 Q8 In a game, two boxes have the following contents. Box $A$ contains $3$ green balls and $4$ white balls.Box $B$ contains $6$ green balls and $5$

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### 2022 ACJC P2 Q7

2022 ACJC P2 Q7 Archer and Betty took part in a competition comprising of at most $3$ games. Each game is either won by Archer or Betty. The first person

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### 2022 DHS P2 Q7

2022 DHS P2 Q7 Commodity $X$ is traded four times a week from Monday to Thursday. The unit price of $X$ can only rise or fall on any day. If

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