Teaching Railway Teacher PRT 2025 Mock Test Series Logical Reasoning Series Number Series

பின்வரும் தொடரில் எந்த எண்ணால் கேள்விக்குறியை (?) மாற்ற முடியும்?

1, 3, 7, 13, 21, 31, ?

1
40
2
41
3
42
4
43
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