Question:medium

Read the sentence below and find out which part contains an error. If there is no error, the answer is "No error".

The mutual co-operation (a) of employees is (b) essential to the success (c) of business. (d)

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Ask whether "co-operation" already includes the meaning of "mutual" on its own.
Updated On: Jul 21, 2026
  • The mutual co-operation
  • of employees is
  • essential to the success
  • of business.
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The Correct Option is A

Solution and Explanation

Step 1: Understanding the Question:
The sentence is split into four parts, and we must find the part that has a grammar error, or say there is no error.

Step 2: Key Formula or Approach:
Check each part for redundancy, meaning two words that repeat the same sense, since that is a common error type in this kind of question.

Step 3: Detailed Explanation:
The word "co-operation" already means working together, so it carries the idea of "mutual" inside its own meaning.
Placing "mutual" in front of "co-operation" repeats the same idea a second time, which is not correct usage.
The remaining parts, "of employees is", "essential to the success" and "of business.", are grammatically fine and need no change.

Step 4: Final Answer:
The error is in part (a), "The mutual co-operation", because "mutual" is redundant before "co-operation".
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