What will come in place of the question mark $(?)$ in the following number series?
$1, 3, 6, 10, 15, ?$
$1, 3, 6, 10, 15, ?$
- A$17$
- B$18$
- C$20$
- D$21$
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What will come in place of the question mark $(?)$ in the following number series?
$3, 9, 27, 81, ?$
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View Solution$\frac{2}{3}, \quad \frac{4}{7}, \quad ?, \quad \frac{11}{21}, \quad \frac{16}{31}$
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