SOLUTION: using inductive reasoning to predict the next line in the pattern 18x19=20x21-(18+19+20+21) 19x20=21x22-(19+20+21+22)

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Question 1119430: using inductive reasoning to predict the next line in the pattern
18x19=20x21-(18+19+20+21)
19x20=21x22-(19+20+21+22)
Answer by Edwin McCravy(20064) About Me  (Show Source):
You can put this solution on YOUR website!
18x19=20x21-(18+19+20+21)
19x20=21x22-(19+20+21+22)
20x21=22x23-(20+21+22+23)

The first number is 20 because there's an 18 and 19 above it
and the next number is 20.

The second number is 21 because there's an 19 and 20 above it
and the next number is 21.

Go through the others the same way, putting down the next number 
after each one.

Edwin