65² = 6 x 7 x _____ + 5²

100

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1000

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Solution

The correct option is A
100

We know that:

For every number (a5) with unit digit 5, we have:

(a5)² = a(a + 1) hundred + 5²

Thus, 65² = (6 X 7) X 100 + 5²

Suggest Corrections

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