Question

Identify the term that will replace the ?

20, 20, 19, 16, 17, 13, 14, 11, ?, ?

• A. 10, 10
• B. 10, 11
• C. 13, 14
• D. 13, 16

Answer 1

Answer: (A)

10, 10

Let the missing terms of the series be $x_1$ and $x_2$.
Thus, the sequence 20, 20, 19, 16, 17, 13, 14, 11, $x_1$, $x_2$ is a combination of two series:
I. 20, 19, 17, 14, $x_1$
II. 20, 16, 13, 11, $x_2$.
The pattern is I is 1, 2, 3, ..
So, missing term, x1= 14-4 = 10.