Evaluate:69 X 71 – InterviewSolution

1.

Evaluate:69 X 71

Answer»

Given 69 X 71

We can write 69 as 70-1 and also 71 as 70+1 We know that (a + b) X (a – b) = a²– b²

Here a= 70 and b = 1

Applying the above formula we get

(70 + 1) X (70 – 1)

= (70)²– (1)²

= 4900 – 1

= 4899

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