Grouped Numbers First Element (Jee Mains) | ExamDuo
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Grouped Numbers First Element
The natural numbers are grouped as follows:
S₁ = {1}, S₂ = {2, 3, 4}, S₃ = {5, 6, 7, 8, 9}, ..., then the first element of S₂₁ is
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A
391
B
399
C
401
D
442
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