Please help me on my multiple answers?

Question

1 an ice cream store has 31 flavors of ice cream and 10 toppings. a regular sudae has one flavor of ice cream, one topping, and comes with or with out whipped cream. how many different ice cream sundaes can be ordered

a 310

b 372

c 620

d 82

2 the probability that an event will occur is11/15 what are the odds that the event will ocur

a 15:11

b 11:15

c 4:11

d 11:4

Answer 1

my guesses would be

1) c

2) b (I'm not so sure about this one)

Answer 2

1) c

It is because permutations and combinations:

ice cream * toppings * whip cream =

(31 choosing 1)(10 choosing 1)(2 choosing1) =

31 * 10 * 2 = 620

2) D

11 times it will occur, and 4 times it wont (at least in theory)