sobrinho

# Create a array with numbers from 1 to 100 in a random order
ary = (1..100).to_a.shuffle + (1..100).to_a.shuffle

idx = 0
paired = ary.map.with_index { |value| [value, idx += 1] }

# Now the numbers are paired; the first is the random number 1-100 the second is its sequence within the 200 entries
puts paired.inspect

# You'll see many entries with equal first values where the first of them has a higher second (sequence) number, meaning it's out of order now