In a sub shop, there are several topping options for creating a sandwich. Alex loves to go to this restaurant every day for lunch and buy a sub. There are five options for meat, four options for vegetable and four options for sauce. If he tries to order a different combination of meats/
vegetable/ sauce every day, how many days will it take before he has to report one of his sandwiches? [4 marks/T]

  80 days

Step-by-step explanation:

For each of the 5 meat choices, there are 4 vegetable choices, so a total of 5·4 = 20 meat/vegetable combinations.

For each of those, there are 4 sauce choices, so a total of ...

  20·4 = 80

meat/vegetable/sauce combinations.

If a different one is ordered each day, it will take Alex 80 days before he must repeat an order.

43

step-by-step explanation:

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column