Question

In psychological theory, there are 66 types of basic instincts in a human being, and personality is determined by the presence or absence (2(2 choices) of these 66 basic instincts. How many different types of personalities can be identified

Answer 1

2145

Explanation:

Given that:

Number of basic instincts present = 66

Number of choices = 2

Using combination :

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

66C2 = 66! / (66 - 2)!2!

66C2 = 66! / 64!2!

66C2 = (66 * 65) / 2

66C2 = 2145 different personalities