3 years ago

How many three digit numbers have exactly two digits equal and the third different?

Mathematics

2 answers:

SOVA2 [1]3 years ago

8 0

The answer is 81 hope this helps! :D

ale4655 [162]3 years ago

4 0

Answer:

The answer should be 81. Hope this helps!

You might be interested in

Please can someone help me with this question.

saw5 [17]

Answer:

Step-by-step explanation:

8 0

2 years ago

Choose the three shapes that have an area of 36 square centimeters

Artemon [7]

Choose the three shapes that have and Area of 36 square centimeters

Step-by-step explanation:

3 0

2 years ago

Whats three quarters of 450

shepuryov [24]

337.5 divide 450 by 4 and multiply the product by 3

8 0

3 years ago

Given that k is a positive integer. Find, in terms of k, an expression for Sn, which is the sum of the integers from 2k to 4k in

Elden [556K]

Answer:

$S_n=3k\cdot (2k+1)=6k^2 +3k$

Step-by-step explanation:

k is a positive integer.

Consider an arithmetic sequence:

$a_1=2k\\ \\a_n=4k\\ \\d=1$

First, find n:

$a_n=a_1+(n-1)\cdot d\\ \\4k=2k+(n-1)\cdot 1\\ \\2k=n-1\\ \\n=2k+1$

Now, find the sum of these 2k+1 terms:

$S_n=\dfrac{a_1+a_n}{2}\cdot n\\ \\S_n=\dfrac{2k+4k}{2}\cdot (2k+1)=\dfrac{6k}{2}\cdot (2k+1)=3k\cdot (2k+1)=6k^2 +3k$

7 0

3 years ago

Marsha notices that all of her siblings are more than 5 foot 2 inches tall but at most 6 foot 1 inch tall. Write an inequality o

mafiozo [28]

Answer:

first make everything inches so you have at least 62 inches and at most 73 inches, now create it.

Step-by-step explanation:

62<x<=73

7 0

2 years ago

Read 2 more answers