If $a N=\{a x: x \in N\}$, then the set $3 N \cap 7 N$ is

JEE MATHEMATICS MCQ: SET THEORY

1 Easy

1 of 1

Understanding +4 | -1

a N=\{a x: x \in N\}

, then the set

3 N \cap 7 N

View answer and explanation

Correct option: A

21 {N}

Option A (

21N

) is correct because the intersection of multiples of 3 and multiples of 7 are multiples of 21.

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S

2 a_1 a_2 a_3 \ldots . . a_{2006}

a_1, a_2, a_3, \ldots ., a_{2006}

S

a N=\{a n: n \in N: b N=\{n b: n \in N\}

c N=\{c N: n \in N\}

b N \cap c N=d N

a, b, c \in N

b, c

A=\{x: x

\}

B=\{x: x

A-B

F(n)

n

[\mathrm{F}(20) \cap \mathrm{F}(16)] \subseteq \mathrm{F}(\mathrm{y})

40 \%

A, 20 \%

10 \%

C

A

C

4 \%

A

C

2 \%

A