Question

Question:-

a) A bag contains 3 blue and 2 red balls. A ball is drawn at random. What is the probability of drawing a red ball?

b) If F of parallelogram DEFG = 90°, find the measure of the remaining angles.

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Answer 1

Answer:

a- 2/5, b- 90○,90○,90○ , because in parallelogram opposite angles are equal

Answer 2

Total number of ways of drawing 2 balls =7C2

Total number of ways of drawing 2 balls =7C2(a) P(Balls are of same colour)

Total number of ways of drawing 2 balls =7C2(a) P(Balls are of same colour)=7C23C2+7C24C2=7C23C2+4C2

Total number of ways of drawing 2 balls =7C2(a) P(Balls are of same colour)=7C23C2+7C24C2=7C23C2+4C2=2!.5!7!2!.1!3!+2!.2!4!=7×33+6=219=73

Total number of ways of drawing 2 balls =7C2(a) P(Balls are of same colour)=7C23C2+7C24C2=7C23C2+4C2=2!.5!7!2!.1!3!+2!.2!4!=7×33+6=219=73(b) P(Balls are of different colour) =7C23C1×4C1