Add back a hint

recitation-sessions/recitation-session-2.md

@@ -46,6 +46,9 @@ Define the function `curry2`, that curries a two arguments function. That is, `c
 def curry2(f: (Double, Int) => Boolean): Double => (Int => Boolean) = ???
 ```
 
+_Hint_: what should `curry2((x, y) => x < y)(1.0)` return?
+
+
 ## Exercise 3.2
 
 Define the function `uncurry2`. It takes a curried function, and creates a two-argument function.