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BITSAT 2010
Exam
BITSAT
Year
2010
Subject
Mathematics
Chapter
Functions

BITSAT 2010 · Mathematics · Functions

A black die and a white die are rolled. Find the probability that...

A black die and a white die are rolled. Find the probability that the number shown by the black die will be more than twice that shown by the white die.

Options

  1. A1/81 / 8
  2. B1/61 / 6
  3. C1/31 / 3
  4. D1/41 / 4

Correct answer

B. 1/61 / 6

Step-by-step solution

The number of favourable cases are shown below:  Number on white die  Number on black die 131415162526\begin{array}{cl}\text{ Number on white die }& \text{ Number on black die }\\ 1 & 3 \\ 1 & 4 \\ 1 & 5 \\ 1 & 6 \\ 2 & 5 \\ 2 & 6\end{array}) There are 6 favourable cases in which the number on black die is more than twice the number on the white die. ∴m=6n= Total number of cases =6×6\begin{aligned}& \therefore \mathrm{m}=6 \\ & \mathrm{n}=\text{ Total number of cases }=6 \times6 \end{aligned}) ( (\therefore) with each die there are six possibilities) (\therefore) Probability \(p=mn=66×6=16(\mathrm{p}=\frac{\mathrm{m}}{\mathrm{n}}=\frac{6}{6 \times 6}=\frac{1}{6})
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