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Sets and Relations question

2022 · 29 Jul · Shift 1 · Q25
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  5. /2022 · 29 Jul · Shift 1 · Q25

Sets and Relations question

2022 · 29 Jul · Shift 1 · Q25

JEE MainMathematicsSets and RelationsMCQ+4 / −1
Let R be a relation from the set {1,2,3,…,60}\{1,2,3, \ldots, 60\}{1,2,3,…,60} to itself such that R={(a,b):b=pqR=\{(a, b): b=p qR={(a,b):b=pq, where p,q⩾3p, q \geqslant 3p,q⩾3 are prime numbers}. Then, the number of elements in R is :
  1. A
    600
  2. B
    660
  3. C
    540
  4. D
    720
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