Permutations and combinations

1. the number of options for each question is 3( not answering, first alternative,second alternative) and all questions have same options. so the total no. of options is 3*3*3*3*3*3 = 3^6 = 729 but this also contains the option no answers answered. henbce 728

for the second question /forum/maths-plz-solve-198734.asp#.T9NJ1LEtjsQ follow this link the answer is given in that the answer is 5775