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Mathematics - mathematics
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The Mathematics Channel: Algebra, Geometry, Problems, Puzzles and History of Mathematics.
The Mathematics Channel: Algebra, Geometry, Problems, Puzzles and History of Mathematics.
Mathematics reveals the beauty of numbers: from algebra and geometry to calculus, problems, proofs and logic. Real-world applications, history of mathematics and elegant solutions for students and amateurs.
Answer: x = 5 Follow @mathematics for more daily puzzles!
Открыть канал и посмотреть медиаHint: Subtract 7 from both sides first.
Открыть канал и посмотреть медиаFind the Missing Number! If 3x + 7 = 22, what is x? 🔢
Открыть канал и посмотреть медиаAnswer: 240 (prime factorisation: 2⁴ × 3 × 5, giving 5×2×2 = 20… actually 2⁴ × 3² = 144, with (4+1)(2+1)=15… answer is 2⁴ × 3² × 5⁰... smallest is 2 × 3² × 5² = 180, factors: (1+1)(2+1)(2+1) = 18 ✓) Follow @mathematics for more daily puzzles!
Открыть канал и посмотреть медиаHint: Think about how factor counts relate to prime exponents.
Открыть канал и посмотреть медиаThe Sneaky Divisor Count Find the smallest positive integer with exactly 18 factors.
Открыть канал и посмотреть медиаAnswer: 3/10 (or 30%) Follow @mathematics for more daily puzzles!
Открыть канал и посмотреть медиаHint: Divide favourable outcomes by total outcomes.
Открыть канал и посмотреть медиаLucky Marble Draw 🎱 A bag has 3 red and 7 blue marbles. You pick one randomly. What is the probability of picking red?
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