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An unbiased coin is thrown 5 times. Let ...

An unbiased coin is thrown 5 times. Let X be a random variable and k be the value assigned to X for k-3,4,5 times Head occurs consecutively and otherwise the value ofXis assigned-1. What is value of expectation. एक निष्पक्षपाती सिक्के को 5 बार उछाला जाता है माना X यादृच्छिक पर है राथा x से अर्जित मान k है जहां k-3.4.5 बार लगातार शीर्ष आता है अन्यथा X को -1 मान दिया जाता है तब इसकी आकाक्षां है-

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