Solve the following
$$113 \times 87 = ?$$
$$113 \times 87 = ?$$
$$(100 + 13) \times (100 - 13) = ?$$
$$(a + b)(a - b) = a^2 - b^2$$
$$(100)^2 - (13)^2 = ?$$
? = 10000 - 169 = 9831
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