Tarot cards are used for telling fortunes, and in a reading, the arrangement of the cards is as important as the cards themselves. How many different readings are possible if three cards are selected from a set of seven Tarot cards?

7P3 = 7*6*5

To find the number of different readings possible when selecting three cards from a set of seven Tarot cards, we can use a combination formula.

In this case, we want to choose three cards from a set of seven, so we can calculate it as "7 choose 3" or written as 7C3.

The formula for combinations, often represented as nCr, is:

nCr = n! / (r!(n-r)!),

where n represents the total number of objects to choose from, and r represents the number of objects to be chosen.

Using this formula, we can calculate the number of different readings:

7C3 = 7! / (3!(7-3)!)

Calculating this, we get:

7C3 = (7 * 6 * 5) / (3 * 2 * 1)

Simplifying further:

7C3 = 35

Therefore, there are 35 different readings possible when selecting three cards from a set of seven Tarot cards.