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JEE Mains · Maths · STD 11 - 6. permutation and combination

त्रिभुज, जिसके शीर्ष \((0,0),(0,41)\) तथा \((41,0)\) हैं, के आंतरिक भाग में स्थित उन बिंदुओं की संख्या जिनके दोनों निर्देशांक पूर्णांक हैं, है

  1. A \(780\)
  2. B \(901\)
  3. C \(861\)
  4. D \(820\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(780\)

Step-by-step Solution

Detailed explanation

\(\frac{x}{a} + \frac{y}{b} = 1\) \(\frac{x}{{41}} + \frac{y}{{41}} = 1\) first point \(=(39,1)\) \( = \mathop \sum \limits_{i = 1}^{39} = \frac{{i\left( {i + 1} \right)}}{2}\) \( = \frac{{39\left( {39 + 1} \right)}}{2}\) \(=780\) units
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