# QUANTITATIVE APTITUDE

Exercise 2.1
For the following, find the next term in the series

1.  6, 24, 60,120, 210

a) 336           b) 366              c) 330              d) 660

Explanation : The series is 1.2.3, 2.3.4, 3.4.5, 4.5.6, 5.6.7, .....          ( '.' means product)

2.  1, 5, 13, 25

Explanation : The series is of the form   0^2+1^2, 1^2+2^2,...

3. 0, 5, 8, 17

Explanation : 1^2-1, 2^2+1, 3^2-1, 4^2+1, 5^2-1

4. 1, 8, 9, 64, 25    (Hint : Every successive terms are related)

Explanation : 1^2, 2^3, 3^2, 4^3, 5^2, 6^3

5. 8,24,12,36,18,54

27

6. 71,76,69,74,67,72

7. 5,9,16,29,54
Explanation : 5*2-1=9; 9*2-2=16; 16*2-3=29; 29*2-4=54; 54*2-5=103

8. 1,2,4,10,16,40,64 (Successive terms are related)
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.

1. 3,5,7,12,13,17,19
Explanation : All but 12 are odd numbers

2. 2,5,10,17,26,37,50,64