How many 3’s are there in the following number series, which are preceded by…
2016
How many 3’s are there in the following number series, which are preceded by an odd number but not followed by an even number? Number Series : 3 4 2 5 1 3 5 2 1 3 7 2 8 7 3 5 9
- A.
One
- B.
Two
- C.
Three
- D.
Four
Attempted by 274 students.
Show answer & explanation
Correct answer: C
Approach: Check each occurrence of 3. The previous number must be odd, and the next number must not be even (i.e., the next is odd or there is no next). Scan the series and evaluate each 3: 3 at position 1: no previous number → does not qualify.
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