Sec 5 WA2 Revision

Probability:

There are 7 blue marbles and 3 red marbles in a bag.

Two marbles are chosen at random, without replacement.

Find the probability that both are of different colours.

Answer explanation

P(RB) + P(BR)

Probability:

There are 7 blue marbles and 3 red marbles in a bag.

Two marbles are chosen at random, without replacement.

Find the probability that both are of the same colour.

Answer explanation

1 - P(both are of different colours)

or

P(BB) + P(RR)

Answer explanation

Use interior angles

Answer explanation

Interior angles.

Answer explanation

-2 divided by 6

Vectors:

There is a point D such that ABCD is a parallelogram.

Find the coordinates of D.

Congruence & Similarity:

Triangles ABD and ECD are similar by ... similarity test.

• AA

• SAS

• SSS

• None of the above.

Answer explanation

There is a pair of corresponding angles AND a common angle.

Congruence & Similarity:

Triangles ABD and ECD are similar.

Find BD.

Congruence & Similarity:

Triangles ABD and ECD are similar.

Find the ratio area of triangle ABD : area of triangle ECD.