bac-s-maths 2020 Q2

bac-s-maths · France · polynesie 1 marks Tree Diagrams Faulty/Random Input Probability

Let $n$ be a natural number greater than or equal to 2.
A bag contains $n$ indistinguishable balls to the touch. All these balls have one ``HEADS'' side and one ``TAILS'' side except one which has two ``TAILS'' sides.
A ball is chosen at random from the bag and then tossed. The probability of obtaining the ``TAILS'' side is equal to: Answer A: $\frac { n - 1 } { n } \quad$ Answer B: $\frac { n + 1 } { 2 n } \quad$ Answer C: $\frac { 1 } { 2 } \quad$ Answer D: $\frac { n - 1 } { 2 n }$

B: $\frac{n+1}{2n}$

Let $n$ be a natural number greater than or equal to 2.

A bag contains $n$ indistinguishable balls to the touch. All these balls have one ``HEADS'' side and one ``TAILS'' side except one which has two ``TAILS'' sides.

A ball is chosen at random from the bag and then tossed.\\
The probability of obtaining the ``TAILS'' side is equal to:\\
Answer A: $\frac { n - 1 } { n } \quad$ Answer B: $\frac { n + 1 } { 2 n } \quad$ Answer C: $\frac { 1 } { 2 } \quad$ Answer D: $\frac { n - 1 } { 2 n }$

Paper Questions

QExercise 2 QExercise 3 QExercise 4 (non-specialization) QExercise 4 (specialization) Q1 Q2 Q3 Q4 Q5