What’s that? You want me to ask more questions? Sure!

So I’m writing a pascals triangle program. My goal is to write it in

fewer lines than those on the RubyQuiz site. My idea is to use more

math, and less programming.

So in order for my method to work, I sorta need to recreate nPr and

nCr functions. To be official and learn more, I am doing this through

a class. However, every time I run it, I get the following errors:

pascal.rb:29:in `pascal': undefined method`

nCr’ for 1:Fixnum

(NoMethodError)

from pascal.rb:24:in `upto' from pascal.rb:24:in`

pascal’

from pascal.rb:41

My code:

# Pascals triangle

class Integer

def self.nPr®

numerator = factorial(self)

denominator = factorial(self - r)

```
@permutations = numerator / denominator
```

end

def self.nCr®

numerator = factorial(self)

denominator = factorial® * factorial(self - r)

```
@combinations = numberator / denominator
```

end

end

def pascal max_row

0.upto(max_row) {|row_num|

```
holder = []
ticker = 0
while ticker != row_num
result = row_num.nCr(ticker)
ticker = ticker + 1
holder = result.push
end
puts holder.join(' ').center(80)
```

}

end

puts ‘How many rows do you want?’

max_row = gets.chomp.to_i

pascal max_row

Any help?

Thanks,

Ari

--------------------------------------------|

If you’re not living on the edge,

then you’re just wasting space.