Question

The number of bijective function from a set A to itself when A contains 106 elements is

• A. 106
• B. $(106{)}^2$
• C. 106!
• D. $2^{106}$

Answer 1

Answer: (C)

If O(A) = n, then bijections from A onto A is n!
$\therefore$ No. of bijections from A containing 106
elements to itself = 106!.