Correct Answer - Option 2 : 4
Concept:
Number of ways to arrange n things in r places is given by, nCr
Calculation:
In word ABLE, there are 2 vowels and 2 consonants.
Total number of letters = 4
Total number of even place = 2
There are 2 vowels to be filled in 2 places.
⇒ The number of ways = 2C2 = 1
⇒ The vowels can arrange among themselves in 2! = 2 ways.
⇒ The 2 consonants can fill the remaining 2 places in 2! = 2 ways.
⇒ Total number of ways = 1 × 2 × 2 = 4 ways.
Hence, option (2) is correct.