Genuine Bank’s website requires that your pin number only be two numerical digits long. So, the first number to choose is from set A below and the second number to choose is from set B below. Find the cross product A × B to determine the number of possible combinations.

A = {0, 2, 4, 6, 8}

B = {1, 3, 5, 7, 9}

Valliant Bank’s website requires that your pin number be two digits long, the first must be a v or b and the second digit must be a number from 1 to 5. Find the cross product C × D to determine the number of combinations possible.

C = {v, b}

Question

Genuine Bank’s website requires that your pin number only be two numerical digits long. So, the first number to choose is from set A below and the second number to choose is from set B below. Find the cross product A × B to determine the number of possible combinations.

A = {0, 2, 4, 6, 8}                      

B = {1, 3, 5, 7, 9}

Valliant Bank’s website requires that your pin number be two digits long, the first must be a v or b and the second digit must be a number from 1 to 5. Find the cross product C × D to determine the number of combinations possible.

C = {v, b}

anonymous · Answer

i think its 25

anonymous · Answer

For the first digit, there are five different choices from set A, right?  And for each of those 5 choices, you can then choose one of the 5 choices from set B for the second digit.

So, how many combinations are there?    5 x 5 = 25

anonymous · Answer

am i right @avijit

anonymous · Answer

you're right for the first part

anonymous · Answer

Part 2 is similar... except the first digit must be either "v" or "b", so there are only 2 choices for the first digit, and still 5 choices for the second digit.