Question:
How many '4's are there in the series which comes between two '5's?
\[
3, 4, 4, 5, 4, 5, 4, 2, 1, 4, 5, 4, 5, 7, 4, 5, 4, 5
\]
How many '4's are there in the series which comes between two '5's?
\[
3, 4, 4, 5, 4, 5, 4, 2, 1, 4, 5, 4, 5, 7, 4, 5, 4, 5
\]
Show Hint
Carefully identify the pairs of '5's and ensure each '4' counted is located strictly between two '5's.
Updated On: Mar 25, 2025
- 4
- 5
- 6
- 3
Show Solution
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The Correct Option is D
Solution and Explanation
To count the number of '4's that appear between two '5's:
- First pair: \( 5, 4, 5 \) ⇒ 1 '4'
- Second pair: \( 5, 4, 5 \) ⇒ 1 '4'
- Third pair: \( 5, 4, 5 \) ⇒ 1 '4'
Counting all valid '4's, there are 3 '4's that meet the condition.
- First pair: \( 5, 4, 5 \) ⇒ 1 '4'
- Second pair: \( 5, 4, 5 \) ⇒ 1 '4'
- Third pair: \( 5, 4, 5 \) ⇒ 1 '4'
Counting all valid '4's, there are 3 '4's that meet the condition.
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