Question

Is the following solution is correct?
99×99-1
=(100-1) (100-1) -1
=(100-1)² -1
=(100)²-2.100.1 + (100)²-1
= 10000 - 200 + 10000-1
=20000-201
=19799

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Answer 1

Answer:

no

i think the answer is 9800