Question

you forgot the three digit access code for your garage door.The first digit is three and the last two digits are odd numbers .How many codes are possible?

Answer 1

25

Answer 2

it is
\[3,\text{odd },\text{odd}\] and so in each spot you have a possibilty of five odd numbers
\[1,3,5,7,9\]

Answer 3

25
because from 1 to 10 there are only 5 odd numbers,
so you need 2 of them, thats why you get the square of 5,
wich is 25:

25 ---> answer

Answer 4

by the "counting principle" there are
\[5\times 5=25\] possibilities