Ask question

Ask question

All categories

3 years ago

9

How many three-digit positive integers have exactly two digits that are the same?

1 answer:

Marysya12 [62]3 years ago

7 0

there are 9∗9∗8 three digit numbers where all digits are different so 1000−9∗9∗8 which have at least two digits that are the same and then there are 9 numbers which have exactly three same digits so the number of three digit numbers where exactly two digits are the same is 1000−9∗9∗8−9=343.Answer:

Step-by-step explanation:

You might be interested in

50 POINTS REWARD!! <br> please answer all of the following questions correctly:

Pani-rosa [81]

$\frac{3x-2}{x^{2}-2x-3} -\frac{1}{x-3}$

factorising the first denominator

x²-2x-3 = x² -3x+x-3 = (x+1)(x-3)

(a) $\frac{3x-2}{(x+1)(x-3)} - \frac{1}{x-3}$

finding LCD

(b) LCD of (x-3)(x+1) and (x-3) is (x-3)(x+1)

(c)

$\frac{3x-2}{(x-3)(x+1)} -\frac{x+1}{(x-3)(x+1)}$

(d)

$\frac{3x-2-(x+1)}{(x-3)(x+1)}$

$\frac{3x-2-x-1}{(x-3)(x+1)}$

$\frac{2x-3}{(x-3)(x+1)}$

5 0

4 years ago

Read 2 more answers

How do you solve this 2x +5 - 7x = 15

Serga [27]

1. combine like terms (2x and -7x) to create -5x
2. subtract 5 from each side to create: -5x=10
3. divide both sides by -5
4. x=-2

7 0

3 years ago

Which statement best explains a negative impact that zebra mussels can have on an ecosystem?

Oduvanchick [21]

The correct answer is D

8 0

3 years ago

You need to buy some chicken for dinner tonight. You found an ad showing that the store across town has it on sale for $2.79 a p

san4es73 [151]

Answer:

B) Going to the close store is cheaper.

Step-by-step explanation:

Cost of going to the next town:

(8.3mi/22mi) × $3.79 = $1.43

Cost of going to the close store:

(2.3mi/22mi) × $3.79 = $0.40

3 0

3 years ago

I will mark brainliest when allowed!

Sergeeva-Olga [200]

Answer:

-0.2

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers