In how many ways two students can exchange greeting cards to each other?

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Solution

Among 2 students A and B,

A sends the greeting card and B receives it.

(or)

B sends the greeting card and A receives it.

So, two students can exchange greeting cards to each other in 2 ways.

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In how many ways two students can exchange greeting cards to each other? ___

Among 2 students A and B, A sends the greeting card and B receives it. (or) B sends the greeting card and A receives it. So, two students can exchange greeting cards to each other in 2 ways.

In how many ways two students can exchange greeting cards to each other?

___

Among 2 students A and B,

A sends the greeting card and B receives it.

(or)

B sends the greeting card and A receives it.

So, two students can exchange greeting cards to each other in 2 ways.