Question

61 × 59 = ______.

Options

• 3,600

• 3,599

• 3,609

• 3,509

Answer 1

61 × 59 = 3,599.

Explanation:

(61)(59) = (60 + 1) (60 − 1)

(a + b) (a − b) = a² − b²

(61) (59) = 60² − 1²

(61) (59) = 3600 − 1

(61) (59) = 3,599