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यह मानते हुये कि सप्ताह के दिनों में अपराह्न 2 बजे से 3 बजे के मध्य की गई 15 टेलीफोन कॉलो में औसतन एक टेलीफोन व्यस्त होता हैं | यदि 6 टेलीफोन नंबर यादृच्छिक मिलाये जायें तो क्या प्रायिकता होगी ?1.तीन से अधिक व्यस्त नहीं हो|2.कम से कम तीन व्यस्त होंगे
Civil Services Entrance Exams-Medium-Hindi
Oneday Exams-Medium-Hindi
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SSC GD
Probability
CLASS-XII (PCM)
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