Q: The unit digit of (3 × 1 + 4 × 2 × 1 + 5 × 3 × 2 × 1 + … + 20 × 18 × 17 × ⋯ × 2 × 1) is
(a)2
(b)3
(c)4
(d)5
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7 previous year questions
Q: The unit digit of (3 × 1 + 4 × 2 × 1 + 5 × 3 × 2 × 1 + … + 20 × 18 × 17 × ⋯ × 2 × 1) is
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