NIELIT 2017 OCT Scientific Assistant A - Section A: 8

Question

Find the missing term:

$60,40,55,45,50,50,?$

• A. $45$
• B. $50$
• C. $55$
• D. $60$

Answer 1

$60,40,55,45,50,50,$______

We can take the alternative numbers from the first term.

• $60 \overset{-5}{\rightarrow} 55$
• $55 \overset{-5}{\rightarrow} 50$
• $50 \overset{-5}{\rightarrow} {\color{Magenta}{45}}$

We can take the alternative numbers from the second term.

• $40 \overset{+5}{\rightarrow} 45$
• $45 \overset{+5}{\rightarrow} 50$

So, the correct answer is $(A).$

Answer 2

Given series having the following pattern:

•  $60-20=40$
•  $40+15=55$
• $55-10=45$
• $45+5=50$
• $50-0=50$
• $50+(-5)={\color{Red}{45}}$

Option (A) is correct.