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JEE Mains · Maths · STD 12 - 8. Application and integration

यदि प्रदेश {(x, y) : \(1 -2x\le y\le4-x^{2}, x\ge0,y\ge0 \)} का क्षेत्रफल \( \frac{\alpha}{\beta} \) है, जहाँ \( \alpha, \beta \in N \) तथा gcd(\(α,β\))=1, तो \( (\alpha+\beta) \) का मान ........... है।

  1. A 73
  2. B 85
  3. C 91
  4. D 67
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Answer & Solution

Correct Answer

(A) 73

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Detailed explanation

Required area \( =\frac{2}{3}\times8-\frac{1}{2}\times\frac{1}{2}\times1 \) \( =\frac{16}{3}-\frac{1}{4}=\frac{61}{12}=\frac{\alpha}{\beta} \) \( \Rightarrow\alpha+\beta=73 \)
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