If there are 18 students every one of the will pair up with 17 other students throughout the year so the total amount of pairs that can be made is 18x17=306 but since it’s not important if student A is paired with student B or student B with student A we should divide the total amount of pairs by two- 306:2=153 so in total there will be 153 projects finished

5 0

3 years ago

How many different 7-digit telephone numbers are possible if the first digit cannot be 0, but the last two digits must be 0?

solniwko [45]

The first digit can only range from 1-9, resulting in 9 possible options. The next four digits can range from 0-9, resulting in 10 options for each. Since the last two digits remain the same, they do not affect the sample size. Using the fundamental counting principle, we can find the amount of telephone numbers possible in the following equation.
$9 \times 10 \times 10 \times 10 \times 10 \times 1 \times 1 \\ 90000$

4 0

3 years ago

12*10-50 i am in a hurry

andreev551 [17]

Answer: 70

Step-by-step explanation:

12*10 = 120-50 = 70

8 0

3 years ago

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