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3 years ago

Pre-Test

Mathematics

2 answers:

Volgvan3 years ago

8 0

Answer:

A and D

Step-by-step explanation:

Ik what question ur talking about and i hope this helps! :)

Anestetic [448]3 years ago

7 0

Then answer is a and d

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Triangle PQR is similar to triangle XYZ. What is the perimeter of triangle XYZ?

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Triangle PQR is similar to triangle XYZ. What is the perimeter of triangle XYZ? Where is the picture

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3 years ago

An urn contains 12 balls, of which 4 are white.

wel

Answer:

a) $\frac{1}{3}$

b) $\frac{4}{12}\,,\,\frac{4}{11}\,,\,\frac{4}{10}\,,...$

Step-by-step explanation:

Number of balls in the urn = 12

Number of white balls in the urn = 4

So, number of balls which are not white = 12 - 4 = 8

We know that probability = No. of outcomes/Total number of outcomes

Let $A_i\,,\,B_i\,,\,C_i$ denotes the event of getting white ball by A, B and C

a) each ball is replaced after being drawn.

Probability = Number of white balls/Total number of balls

Solution: $P(A_i)=P(B_i)=P(C_i)=\frac{4}{12}=\frac{1}{3}$

b)the balls that are withdrawn are not replaced.

Solution:

If A wins: $P(A_1)=\frac{4}{12}=\frac{1}{3}$

If A lost and B wins: $P\left ( B_1|A_1^{c} \right )=\frac{4}{11}$

If A and B lost and C wins: $P\left ( C_1|A_1^{c}\,B_1^{c} \right )=\frac{4}{10}$

and so on....

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4 years ago

2x - 5x = what does it equal <br><br> Helppppp

erma4kov [3.2K]

Answer:

-3x hope this helps you good luck

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4 years ago

Read 2 more answers

Cuál es primer número natural o entero positivo que conoces

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Answer:

Los números naturales incluyen solo enteros positivos y comienzan desde 1 hasta infinito

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3 years ago

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Answer:

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Step-by-step explanation:

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