Question

How many 5’s are there in the following sequence which are immediately followed by 3 but not immediately preceded by 7?
8953253855687335775363535738

• A. One
• B. Two
• C. Three
• D. Four

Hint:

When solving problems with sequences, break the problem into smaller steps: look for specific patterns, then check the conditions given in the question to identify the correct elements.

Answer 1

The Correct Option is C

Step 1: Analyze the sequence.
The sequence is:
8953253855687335775363535738
We need to identify all occurrences of 5’s that are immediately followed by 3, and not preceded by 7.
Step 2: Identify 5’s followed by 3.
The positions of 5 followed by 3 in the sequence are:
5 (in position 3) followed by 3 (in position 4)
5 (in position 12) followed by 3 (in position 13)
5 (in position 18) followed by 3 (in position 19)
Step 3: Check if the 5’s are preceded by 7.
The first 5 (position 3) is not preceded by 7.
The second 5 (position 12) is not preceded by 7.
The third 5 (position 18) is not preceded by 7.
Step 4: Conclusion. There are three occurrences of 5 that are immediately followed by 3 but not immediately preceded by 7. Hence, the correct answer is (3) Three.