Question

Let A = {1, 2, 3, …. n} and B = {a, b}. Then the number of surjections from A into B is ____________.

विकल्प

• `""^n"P_2`

• 2ⁿ – 2

• 2ⁿ – 1

• none of these

Answer 1

Let A = {1, 2, 3, …. n} and B = {a, b}. Then the number of surjections from A into B is 2ⁿ – 2.