1. coin tossing, the possibility is not 1/2, ask what is possibility of get head?

1). the possibility of head is twice that of tail.

2). the possibility of one head and one tail is 4/9.

2. d=2^64, d^d=2^p.  p=?

thanks first.

somebody said the first is A.

the second: right.

how to solve it ? pls tell the detail.