Outline of encyclopedia of algorithm in ancient mathematics books

The (1) expansion * * * has five terms, and the coefficients of the expansion are 1, 4, 6, 4, 1 respectively.

(2) The expansion * * * has n+ 1 and the coefficient sum is 2 n. 。

So the answer is: (1) 5; 1,4,6,4, 1; (2)n+ 1，2 n。