(B) To evaluate $205 \times 195$,we can use the algebraic identity $(a + b)(a - b) = a^2 - b^2$.We can write $205$ as $(200 + 5)$ and $195$ as $(200 -

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(B) To evaluate $205 \times 195$,we can use the algebraic identity $(a + b)(a - b) = a^2 - b^2$.We can write $205$ as $(200 + 5)$ and $195$ as $(200 - 5)$.So,$205 \times 195 = (200 + 5)(200 - 5)$.Applying the identity,we get $200^2 - 5^2$.$200^2 = 40000$ and $5^2 = 25$.Therefore,$40000 - 25 = 39975$.