Some people are destined to

[Rachel Adams]

Is each sentence idiomatic? Context: it's said in a conversation about life.

1. Some people are destined to live a happy life, while others aren't.
2. Some people are destined to live a happy life and some (people ) are destined to live a life full of problems.
3. Some people are destined to live a happy life and some (people) a life full of problems.
4. Someone is destined to live a happy life, and someone (is destined to live) a life full of problems.

 

[Tarheel]

Perhaps: "Some people are destined to lead happy lives, but others have different fates awaiting them.

Being happy doesn't mean you don't have problems.

 

[Piscean]

1. Some people are destined to live a happy life, while others aren't.
2. Some people are destined to live a happy life and some (people ) are destined to live a life full of problems.
3. Some people are destined to live a happy life and some (people) a life full of problems.
4. Someone is destined to live a happy life, and someone (is destined to live) a life full of problems.

The first three are grammatical. The fourth does not work.