Test Index

JAMB Mathematics 2018 Paper

Question : 55

Total: 62

Which one of the following gives the members of the set A1 n B n C?

Solution:

Concept:

The notation

A'

(written as A1 in the question) means the complement of set

A

Explanation:

From the Venn diagram, the sets are:

A' = \{s, w, x, y, z\}

B = \{r, s, t, u\}

C = \{t, u, v, w, x\}

We need the elements common to all three sets.

First find

B \cap C = \{t, u\}

Now check whether

t

u

is in

A'

Neither

t

nor

u

is in

A'

Also, no element from

A'

such as

s, w, x, y, z

is in both

B

and

C

Therefore, there are no common members.

So,

A' \cap B \cap C = \Phi

Answer:

\Phi

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