How many different word, with or without meaning, can be formed by using the letter of the word COVID?

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CSIR-CLRI JSA 2024 Official Paper-I (Held On: 16 Feb, 2025)
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  1. 60
  2. 150
  3. 100
  4. 120

Answer (Detailed Solution Below)

Option 4 : 120
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Detailed Solution

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Given:

The word is COVID

Number of letters = 5

Formula used:

Number of different words = n!

Where n = number of letters

Calculation:

Number of different words = 5!

⇒ Number of different words = 5 × 4 × 3 × 2 × 1

⇒ Number of different words = 120

∴ The correct answer is option (4).

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