CAPF 2025United NationseasyQ58Q: 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)5Answer with full explanation — CAPF 2025 →Report Issue
