Fix some typos

Part 2 - Sequence Basics/2. Reducing a sequence.md

@@ -20,7 +20,7 @@ public final Observable<T> filter(Func1<? super T,java.lang.Boolean> predicate)
 
 ![](https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/filter.png)
 
-We will use `filter` to create a sequence of numbers and filter out all the even ones, keeping only odd values.
+We will use `filter` to create a sequence of numbers and filter out all the odd ones, keeping only even values.
 
 ```java
 Observable<Integer> values = Observable.range(0,10);

Part 2 - Sequence Basics/5. Transformation of sequences.md

@@ -57,7 +57,7 @@ Map: 6
 Map: Completed
 ```
 
-This was something we could do without `map`, for example by using `Observable.range(3,4)`. In the following, we will do something more practical. The producer will emit numeric values as a string, like many UIs often do, and then use `map` to convert them to a more processable integer format.
+This was something we could do without `map`, for example by using `Observable.range(3,7)`. In the following, we will do something more practical. The producer will emit numeric values as a string, like many UIs often do, and then use `map` to convert them to a more processable integer format.
 
 ```java
 Observable<Integer> values =