गणित (Mathematics) – Mathematics MCQ
गणित (Mathematics) – इन्जिनियरिङ प्रवेश
Mathematics · Engineering Entrance – Mathematics, Physics, Chemistry & English · १,३०८ प्रश्न
१,३०८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
गणित (Mathematics): प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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The value of C₀ + C₁/2 + C₂/3 + ... + Cₙ/(n + 1), where Cᵣ = ⁿCᵣ, is:
सही उत्तर: ख) (2ⁿ⁺¹ − 1)/(n + 1)
Integrate (1 + x)ⁿ = Σ Cᵣ xʳ from 0 to 1: Σ Cᵣ/(r + 1) = [(1 + x)ⁿ⁺¹/(n + 1)]₀¹ = (2ⁿ⁺¹ − 1)/(n + 1).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A committee of 4 is to be chosen from 5 married couples so that no husband and wife both serve. The number of ways is:
सही उत्तर: ख) 80
Choose the 4 couples to be represented in ⁵C₄ = 5 ways and then one partner from each in 2⁴ = 16 ways: 5 × 16 = 80.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many subsets of {1, 2, 3, ..., 10} (including the empty set) contain no two consecutive integers?
सही उत्तर: ग) 144
If aₙ counts such subsets of {1, ..., n}, then aₙ = aₙ₋₁ + aₙ₋₂ with a₁ = 2, a₂ = 3 (Fibonacci numbers), giving a₁₀ = 144.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In how many ways can 4 men and 4 women sit at a round table so that men and women alternate?
सही उत्तर: क) 144
Seat the men round the table in (4 − 1)! = 6 ways, then the women in the 4 gaps in 4! = 24 ways: 6 × 24 = 144.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The total number of squares (of all sizes) on an ordinary 8 × 8 chessboard is:
सही उत्तर: क) 204
There are (9 − k)² squares of side k, so the total is 1² + 2² + ... + 8² = 204.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In how many ways can three different numbers be chosen from 1, 2, ..., 20 so that their sum is even?
सही उत्तर: ग) 570
The sum is even when all three are even or exactly one is even: ¹⁰C₃ + ¹⁰C₁ × ¹⁰C₂ = 120 + 450 = 570.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of 5-digit palindromic numbers (reading the same forwards and backwards, e.g. 12321) is:
सही उत्तर: क) 900
The number is fixed by its first three digits: 9 choices for the first (non-zero) and 10 each for the second and third, giving 9 × 10 × 10 = 900.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If 2ˣ = 3ʸ = 6ᶻ (all non-zero), then z equals:
सही उत्तर: ग) xy/(x + y)
Let the common value be k: 2 = k^(1/x), 3 = k^(1/y), 6 = k^(1/z). Since 6 = 2 × 3, 1/z = 1/x + 1/y, so z = xy/(x + y).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The solution of log₂(x − 1) + log₂(x − 3) = 3 is:
सही उत्तर: ग) x = 5
(x − 1)(x − 3) = 8 gives x² − 4x − 5 = 0, so x = 5 or x = −1; x = −1 is rejected because the logarithms must have positive arguments.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The sum to infinity of 1/(1·2·3) + 1/(2·3·4) + 1/(3·4·5) + ... is:
सही उत्तर: घ) 1/4
1/(k(k+1)(k+2)) = ½[1/(k(k+1)) − 1/((k+1)(k+2))], which telescopes to ½ × 1/(1·2) = 1/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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