Question

9. Amy has to visit towns B and C in any order. The roads connecting these towns with her home are shown on the diagram. How many different routes can she take starting from A and returning to A, going through both B and C (but not more than once through each) and not travelling any road twice on the same trip?

Answer 1

8. 230 + 230 + 230 + 230 =

A. 8120
B. 830
C. 232
D. 230
E. 226

Answer 2

how do you have two identical questions opened at the same time?

Answer 3

I answered the 1st question in your other post. the answer to the second question is not one of your options.

Answer 4

@ehuman it's totally the abs.

Answer 5

@Kainui I didn't understand your comment

Answer 6

unless it is somehow implied that you need to determine the average...

Answer 7

oh... abs... lol I didn't see the avatar.

Answer 8

ACBA or ABCA
A to C - two possible ways
C to B - two possible ways
ACBA - four possible ways
Similarly, ABCA - four possible ways

Total: 8 possible ways.

Answer 9

What is the average (arithmetic mean) of all the multiples of ten from 10 to 190 inclusive?

Answer 10

Arithmetic sum = 10(1 + 2 + 3 ..... + 19) = 10 * (1+19)/2 * 19 = 10 * 10 * 19
Mean = sum / how many numbers = 10 * 10 * 19 / 19 = 100