Verbal Reasoning - Mental Ability Questions

First ten odd numbers form an arithmetic progression of the form
1,3,5,7,9......
here a = first term = 1
d = common difference = 2
Average of first n numbers = (2a + (n - 1)d)/2
n th term of the AP = a + (n - 1)d
Substituting a = 1, d = 2 and n = 10 in the above formulas
average of first 10 numbers = 10
10 th term of the AP = 19
Therefore average of first 10 terms is 19 - 10 = 9 greater than
the last term. Hence the average is greater than the sum by
9/19 X 100 = 900/19 %

The first letter moves two steps forward.
The second letter moves 2 steps forward.
The third letter moves one step backward.

In all other pairs , second requires the first to function.

Durable means able to withstand wear, pressure.

Antonyms for Durable are Delicate, Flimsy, Short-lived.

Radiation shows the property of spreading while the rest three shows concentration at a point.

The series is a b c c a b | b c a a b c | a b c c a b

Here, the pattern a b c c a b | b c a a b c is repeated alternatively.