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3 years ago

A bag has 2 red marbles, 1 blue marble and 4 gold marbles. What is the probability of drawing two gold marbles, if the first mar

ble is replaced after it is drawn?
A) 2/7
B)16/49
C)4/7
D)7/13

Mathematics

1 answer:

Svet_ta [14]3 years ago

3 0

$|\Omega|=7^2=49\\ |A|=4^2=16\\\\ P(A)=\dfrac{16}{49}\Rightarrow \text{B}$

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Answer:

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3 years ago

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myrzilka [38]

Answer:

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Step-by-step explanation:

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3 years ago

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A wooden rod of 5 m 75 cm was cut into 5 equal pieces. What is the length of each piece.

hram777 [196]

We have: 5m 75cm = 5.75 m

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2 years ago

X + 7y = "70" 3x − 6y = −33 step by step

Aneli [31]

Answer:

x=7

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Step-by-step explanation:

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3 years ago

How many 4 digit multiples can not be divided by 5

Advocard [28]

Answer:

1800

Step-by-step explanation:

Let us solve this question by Modular Airthmatic.

Let the lowest 4 digit number be X.

X= 1 (mod 5)

X =2 (mod 5)

X=3 (mod 5)

X =4 (mod 5)

X=1+5 t where t is any integer.

1+5 t=2 (mod 5)

5 t=1 (mod 5 )

5 is the Modular Inverse of modulo 5

t=1 (mod 5)

t =1+5 u : u= any integer.

X becomes 1+ 5 (1+5u )=6+25 u

6+25u =3 (mod 5)

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Take w=201

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For 4 digit largest number, take

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No. of Numbers =(1995 - 200 )+1=1800 □Ans.

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3 years ago

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