Question

Sara has 20 sweets.

Answer 1

17/29 + 6/29 + 4/29
= 27/30
1 - 27/29 = 2/29 = 0.069

Answer 2

Simple probability question. 

The probability that the 2 sweets will not be the same = 1 - probability of same 2 sweets.

There are 3 possible outcomes where the two sweets will be the same. If she had 2 Liquorice or 2 mint or 2 humbug.

P(2 Liquorice) = 12/20 * 11/19
P(2 Mint) = 5/20 *4/19
P(2 Humbug) = 3/20 * 2/19

All of those added together will give you the probability of her getting 2 of the same time of sweet. 

You the take that answer and subtract it from 1.


I hope that helps.