Recent activity by Vignaneswarkrishna

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In a class definition with $10$ methods, to make the class maximally cohesive, number of direct and indirect connections required among the methods are$90,0$$45,0$$10,10$...
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please provide a detailed solution
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please provide the detailed solution
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how? please explain
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Question number 249
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Let S={a,b,c,d,e}. Number of strings of length 5 possible with the letters of S , so that atleast two A's are consecutive is?Answer given is : 421
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A fair coin is tossed repeatedly till both head and appear atleast once. The average number of tosses required is?
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please explain this question