HCL General Aptitude Questions Aptitude Questions Set V
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For the following, find the next term in the series

6, 24, 60, 120, 210

336

366

330

660
Answer: (a)
Explanation: The series is 1.2. 3, 2.3. 4, 3.4. 5, 4.5. 6, 5.6. 7, ____ ( ‘’ means product)


1, 5, 13, 25 Answer: 41 Explanation: The series is of the form 0^{2} + 1^{2}, 1^{2} + 2^{2}, …

0, 5, 8, 17 Answer: 24 Explanation: 1^{2} − 1, 2^{2} + 1, 3^{2} − 1, 4^{2} + 1, 5^{2} − 1

1, 8, 9, 64, 25 (Hint: Every successive terms are related) Answer: 216 Explanation: 1^{2}, 2^{3}, 3^{2}, 4^{3}, 5^{2}, 6^{3}

8, 24, 12, 36, 18, 54 Answer: 27

71, 76, 69, 74, 67, 72 Answer: 67

5, 9, 16, 29, 54 Answer: 103 Explanation: 5 * 2 − 1 = 9; 9 * 2 − 2 = 16; 16 * 2 − 3 = 29; 29 * 2 − 4 = 54; 54 * 2 − 5 = 103

1, 2, 4, 10, 16, 40, 64 (Successive terms are related) Answer: 200 Explanation: The series is powers of 2 (2^{0}, 2^{1}, ). All digits are less than 8. Every second number is in octal number system. 128 should follow 64.128 base 10 = 200 base 8.
Exercise 2.2
Find the odd man out:

3, 5, 7, 12, 13, 17, 19 Answer: 12 Explanation: All but 12 are odd numbers

2, 5, 10, 17, 26, 37, 50, 64 Answer: 64 Explanation: 2 + 3 = 5; 5 + 5 = 10; 10 + 7 = 17; 17 + 9 = 26; 26 + 11 = 37; 37 + 13 = 50; 50 + 15 = 65

105, 85, 60, 30, 0, 45, 90
Answer: 0
Explanation: 105 − 20 = 85; 85 − 25 = 60; 60 − 30 = 30; 30 − 35 = 5; 5 − 40 = 45; 45 − 45 = 90.