# Sum of a series

```ruby
say sum(1..1000, {|n| 1 / n**2 })
```

Alternatively, using the *reduce{}* method:

```ruby
say (1..1000 -> reduce { |a,b| a + (1 / b**2) })
```

#### Output:

```
1.64393456668155980313905802382221558965210344649
```