Given: 1, 1, 4, 8, 9, 27,_, _ Calculation: There are two series in the given number series. The first series is of the square of the numbers ⇒ 1, 4, 9, 16 The second series is of the cube of the numbers ⇒ 1, 8, 27, 64 ∴ 16, 64 will come in the place of ?.