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Kipish [7]
3 years ago
9

Consider a collection of envelopes consisting of 3 red envelopes​, 3 blue envelopes​, 3 green envelopes​, and 3 yellow envelopes

. If three envelopes are selected at​ random, without​ replacement, determine the probability that at least one envelope is a green envelope.
Mathematics
1 answer:
kvv77 [185]3 years ago
5 0
3/10 x 2/9 x 1/8=1/120
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What procedure will find the sum a+b of two numbers where a and b represent any integer?
ElenaW [278]

Answer:As rational number includes natural number, whole number ,integers  also.

⇒Natural number(1,2,3,4....) is a rational number also.

So, when A= Natural number , B=Any other natural number

Just add two natural number using simple law of addition.

⇒As Whole numbers(0,1,2,3,...) are Rational number also.

So If A=any whole number, B=Any other whole number

Add the whole number in any order using law of addition.

⇒Coming to integers (....-123,....-5,...-1,....12,....59,.....) By taking any two integers ,

1. Both of them are positive add using simple law of addition.

2. One of them is positive and other is negative , if larger one has positive sign before it just subtract smaller one from larger one and put positive sign before the result.and if larger one has negative sign before it ,subtract smaller one from larger one and put negative sign before the result.

⇒If both of them are negative , just add the two integers and apply negative sign before the result.

4. Rational number as fractions ,

A=m/n and B=p/q

A+B=m/n + p/q

find LCM of n and q.

If n and q are co-prime multiply n and q to get the LCM.For example if n=5, q=7, then LCM=5×7=35

If n and q are not co-prime find the factors of n and q .take out the common factors and then multiply the common factors with those factors which are not common.

For example, n=15, q=20

15=5×3

20=2×2×5

common factor=5

non common factor=2,2,3

LCM=5×2×2×3=60

Suppose LCM(n,q)= K

⇒p/q+m/n

=

So ,

which is the way to find LCM of rational number when theyare fractions.

Step-by-step explanation:

4 0
2 years ago
If seven is added to four times a number, the result is twenty-five more than the number. Round your answer to the nearest integ
posledela

Answer:

6

Step-by-step explanation:

first, set up the equation

4x+7 = x+25

solve for x:

4x = x + 18

3x = 18

x = 6

have a wonderful day! :)

7 0
3 years ago
Sean used 3/4 of sugar to make a dozen brownies. how many sugar is in each brownie
charle [14.2K]
1/16 of a cup is in each brownie
4 0
3 years ago
$21 is what percent of $28
saveliy_v [14]

Answer:

75%

Step-by-step explanation:


4 0
3 years ago
Solve A=1\2h(b+c) for b
mr_godi [17]
B=2A/h - c
i hope that is correct cuz there are no values
6 0
3 years ago
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