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1.  
9, 15, 21, 27, 33, ?

Correct Answer: C [39]

Explanation:

+6 every time: 33 + 6 = 39.

2.  
5, 15, 45, 135, 405, ?

Correct Answer: A [1,215]

Explanation:

× 3 every time: 405 × 3 = 1,215.

3.  
3, 6, 11, 18, 27, ?

Correct Answer: B [38]

Explanation:

n² + 2: 6² + 2 = 38.

4.  
6, 9, 15, 24, 36, ?

Correct Answer: D [51]

Explanation:

Differences 3, 6, 9, 12, 15 → 36 + 15 = 51.

5.  
1, 8, 27, 64, 125, ?

Correct Answer: D [216]

Explanation:

Cubes: 6³ = 216.

6.  
2, 3, 5, 7, 11, ?

Correct Answer: A [13]

Explanation:

Consecutive primes: after 11 comes 13.

7.  
1, 5, 13, 29, 61, ?

Correct Answer: B [125]

Explanation:

× 2 + 3: 61 × 2 + 3 = 125.

8.  
3, 4, 7, 11, 18, 29, ?

Correct Answer: C [47]

Explanation:

Each term = sum of the previous two: 18 + 29 = 47.

9.  
4, 20, 7, 18, 10, 16, ?

Correct Answer: D [13]

Explanation:

Odd places 4, 7, 10, 13 (+3); even places 20, 18, 16 (−2).

10.  
Fill in the blank: 120, 60, 30, 15, ?

Correct Answer: C [7.5]

Explanation:

÷ 2 every time: 15 ÷ 2 = 7.5.

11.  
Find the wrong number: 6, 13, 27, 55, 111, 222

Correct Answer: A [222]

Explanation:

× 2 + 1: 111 × 2 + 1 = 223, not 222.

12.  
True or false? "The next term of 2, 6, 18, 54 is 162."

Correct Answer: A [True]

Explanation:

× 3 each time: 54 × 3 = 162.

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