LambdaCalcSyntax2.init() LambdaCalcSyntax2.expressions LambdaCalcSyntax2.answer LambdaCalcSyntax2.hint4

How many of the following numbered expressions are syntactically correct λ expressions?

expressions
CorrectAnswer
  1. 0
  2. 1
  3. 2
  4. 3
  5. 4

Remember that parentheses are not optional.

Parentheses must surround every application expression, but nothing else.

If you are struggling to complete this problem, you should go back and practice with the previous problem.

hint4