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21. According to a formula, the max regions formed when four circles intersect is 13.

Given n intersecting circles, the correct formula is:

- n x (n - 2) + 2
- n x (n - 1) + 3
- n x (n - 2) + 1
- n x (n - 1) + 1

n x (n - 1) + 1

22. Cameroon, France, Germany and Italy comprise group 'D' of a soccer competition. How many games are to be played if all countries play with each other once?

- 3
- 4
- 6
- 8

C. 6 games.

In calculations involving combinations, order is irrelevant.

nCr=n!/r!(n-r)!

where: n= total number of teams(4)

r= number of teams(2)

23. Spain, Belgium and China comprise group 'A' of a soccer competition. In this group two countries will qualify for the knock out stage. How many different ways can these two teams be ordered?

- 3
- 4
- 6
- 8

C. 6 ways of ordering the top two teams.

In calculations involving permutations, order is relevant.

Formula: nPr=n!/(n-r)!

where: n= total number of teams (3)

r= number of teams (2)

24. Joe, Jane and Mary are in the park chatting on a bench. How many different ways can they be seated?

- 3
- 4
- 6
- 8

C. There are 6 different seating arrangements.

In calculations involving permutations, order is relevant.

Formula: nPr=n!/(n-r)!

where: n= total number of people (3)

r= number of people(3)

25. Jenna is going to a party and has 4 tops, 3 skirts and a pair of shoes in her wardrope. How many possible outfits can she create?

- 8
- 10
- 12
- 14
- 18

The total number of outcomes is calculated by multiplying all the events together.

4*3*1=12 outfits.