Test Index

NDA Math Sets Relations and Functions

DIRECTIONS (Qs. 21-23) : Read the following information and answer the three items that follow:

Consider the following Venn diagram, where

X, Y

and

Z

are three sets. Let the number of elements in

Z

be denoted by

n(Z)

which is equal to 90.

[NDA-I 2020]

Question : 36 of 90

Marks: +1, -0

Y

Z

b ?

Solution: 👈: Video Solution

n(z)=90

12+18+17+C=90 \Rightarrow C=43

From question,

\frac{n(y)}{n(z)}=\frac{4}{5}

\frac{16+18+17+b}{90}=\frac{4}{5}

b=72-51=21

Go to Question:

Prev Question

Next Question