SELECT * FROM question_mgmt as q WHERE id=9805 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=6 AND chapterId=282 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th mathematics Probability a bag contains 5 red balls and some blue balls if

Question:

A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.

Answer:

Let the number of blue balls = x

Number of red balls = 5

Therefore, total no. Of balls = 5 + x

P(E) of drawing a blue ball = [x / (5 + x)] ...........(I)

P(E) of drawing a red ball = [5 / (5 + x)] 

Acc. to question,

P(E)B  = 2 P(E)R

[x / (5 + x)] = 2 [5 / (5 + x)]

x = 10


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