A box contains 10 red marbles, 3 white marbles, and 17 blue marbles. If a marble is picked from the box at random, what is the probability that the marble is not blue?

  • matematika

    Subject:

    Math
  • Author:

    zoey15
  • Created:

    1 year ago

Answers 2

Answer:

The probability of getting not blue marbles will be 13/30

answer img

Answer:

Let box contains red marbles be R1, R2, R3, R4, R5, R6, R7, R8, R9, R10

Let box contains with white marbles be W1, W2, W3

Let box contains with blue marbles be B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, B11, B12, B13, B14, B15, B16, B17

Let S be the sample space

n(S) =R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, W1, W2, W3, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, B11, B12, B13, B14, B15, B16, B17

n(S) =30

Let A be the event that marble picked from box is not blue

P(A) =R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, W1, W2, W3

P(A) =13

By definition of probability,

P(A) =n(A) /n(S)

13/30

Ans :- P(A) =13/30

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