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Relations and Functions: JEE Mains 2024 1st Feb Shift 1

Medium· Cartesian product and relations· +4 / 0

Let

S=\{1,2,3,\ldots,20\}

,

R_1=\{(a,b):a\text{ divide }b\}

,

R_2=\{(a,b):a\text{ is integral multiple of }b\}

,

a,b\in S

.

n(R_1-R_2)=

?

Your answer (numerical)

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