a. consecutive rolls mean multiplication of each individual probability. there is 1 one on a die, and 6 total outcomes which means a 1/6 probability each time(no need to subtract 1, you can't take the #1 off of a die.)
next multiply 1/6 times 1/6 times 1/6 times....a total of 5 times.
b. how many odd numbers are there on a die? 1,2,3,4,5,6 possibilities, so 1,3,5 are odd. 3/6 probability.
consecutive rolls mean multiplication. 3/6 times 3/6 times.... a total of 5 times. reduce you answer.