1. write the first ten multiples of these pairs of number and find their lcm
a) 2, 3

Multiples:

2: 2 4 6 8 10 12 14 16 18 20

3: 3 6 9 12 15 18 21 24 27 30

The LCM is 6 (underlined)

4/5

Step-by-step explanation:

The bus may leave at 11:45, or 11:46, or 11:47, or 11:48, or 11:49.

If he catches the 11:45 bus, he arrives at his friend at 11:57 and makes it.

If he catches the 11:46 bus, he arrives at his friend at 11:58 and makes it.

If he catches the 11:47 bus, he arrives at his friend at 11:59 and makes it.

If he catches the 11:48 bus, he arrives at his friend at 12:00 and makes it.

If he catches the 11:49 bus, he arrives at his friend at 12:01 and does not make it.

p(making it on time) = 4/5