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- #1
- largest_num = 0
- (1..999).each do |i|
- (2..999).each do |j|
- if (i*j).to_s == (i*j).to_s.reverse
- largest_num = i*j if i*j > largest_num
- end
- end
- end
- puts largest_num
- #2
- ans = 1
- (1..20).each do |i|
- ans = (ans * i)/ans.gcd(i)
- end
- puts ans
- #3
- (1..1000).each do |a|
- (2..1000).each do |b|
- c = 1000 - a - b
- if a**2 + b**2 == c**2 && b > a && c > b
- # puts a,b,c
- puts a * b * c
- end
- end
- end
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