1. We decided to go abroad.

Question

2. We made up our mind to go abroad.
3. We made a decision to go abroad.
4. We made up our minds to go abroad.

(Are they all interchangable? Do we have to use the plural form 'minds' or the singular form 'mind'?)

5. We determinded to go abroad.
6. We made a determination to go abroad.
7. We made up our determination to go abroad.

(Are the three sentences the same?)

Answer 1

1. We decided to go abroad.
2. We made up our mind to go abroad.
These above would just use the word the plural form of mind.
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and yes all three last sentences are the same.