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217 x 217 + 183 x 183 = ?

84521
87487
80578
78458

Correct Answer: 80578

Explanation:

$2172 + 1832$

= $200 + 17 2 + 200 - 17 2$

It is in the form of $a + b 2 + a - b 2 = 2 a 2 + b 2$

= 2(40000 + 289) = 80578.

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