18.3, 20.6, 16, 22.9, 13.7, 2.2, 11.4

Question

Accepted Answer

Step-by-step explanation:

1. Split the series into two subsequences by position:
   - Odd positions (1,3,5,7): 18.3, 16, 13.7, 11.4
   - Even positions (2,4,6): 20.6, 22.9, 2.2

2. Check the odd-position subsequence:
   - $18.3-16=2.3$
   - $16-13.7=2.3$
   - $13.7-11.4=2.3$
   So the odd terms decrease consistently by $2.3$.

3. Check the even-position subsequence:
   - $20.6+2.3=22.9$
   - Therefore the next even term should be $22.9+2.3=25.2$, not $2.2$.

4. Conclusion: the term $2.2$ (option A) does not fit the pattern and is the wrong number.

FINAL_ANSWER: a

Answer

Answer

Answer

Answer