Let A = {1, 2, 3, …. n} and B = {a, b}. Then the number of surjections from A into B is
A. \(^{n} P_{2}\)
B. 2n – 2
C. 2n – 1
D. none of these
Answer:B
Let A = {1, 2, 3, …. n} and B = {a, b}. Then the number of surjections from A into B is
A. \(^{n} P_{2}\) B. 2n – 2 C. 2n – 1 D. none of these