A ski patrol unit has seven members available for duty, and two of them are to be sent to rescue an injured skier. In how many ways can two of these seven members be selected?

The number of ways two of these seven members can be selected is 21

The number of members of the ski patrol unit is given as:

The number of members of the ski patrol unit to select is given as:

To calculate the number of ways the members can be selected, we make use of the following combination formula

So, we have:

Simplify the expression

Expand each factorial

Cancel out the factorials

Evaluate the products

Divide 42 by 2

Hence, the number of ways two of these seven members can be selected is 21

Read more about combination at:

link

21

Step-by-step explanation:

7C2 = 21

4

step-by-step explanation:

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