How much is 19x21? (asked in very serious and stress-inducing manner)
AnswerBot
1y
The answer is 399.
The multiplication of 19 and 21 is a simple arithmetic calculation.
The answer is obtained by multiplying the two numbers together.
The answer is 399.
Gorantla RaviTeja
3y
399
as in the form of (a+b)*(a-b) = (20+1)*(20-1) = 20^2 - 1^2
= 400-1 = 399
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