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Answer by rauchers
1 - 0.5 ^(n-1) >=0.95
0.5^(n-1) >=0.05
ln 0.5^(n-1) >=ln 0.05
n-1 >= ln 0.05 / ln 0.5
n-1 >= 4.32
n> = 5.32
n=6
explaining
no mather what sex the first child has
the probability that secound child has the same sex is 0.5
and the probability th at 2nd and 3th child have the same sex is 0.5^2
so the probability that all n childs have the same sex is
0.5^(n-1)
to have at least one from other sex
1- 0.5^(n-1)
and it must be greater or equal to 0.95
1- 0.5^(n-1) >=0.95
Charles M. Schulz, the most widely syndicated and beloved cartoonist of all time, is also one of the least understood figures in American culture. Now, acclaimed biographer David Michaelis gives us the first full-length biography of the brilliant, unseen man behind Peanuts: at once a creation story, a portrait of a native genius, and a chronicle contrasting the private man with the central role he played in shaping the national imagination. Schulz and Peanuts is the definitive epic biography of an American icon and the unfo rgettable characters he created.
Amazon Significant Seven, October 2007: There's no book this year that made people's eyes light up when I told them about it more than Schulz and Peanuts, David Michaelis's new biography of cartoonist Charles Schulz. (And when they saw the obvious-but-brilliant Chip Kidd-designed cover, their eyes got even brighter.) Everyone, it seems, feels a personal connection to Peanuts (a name, by the way, that Schulz always hated), but few have a sense of the artist whose small troupe of big-headed characters still lives at the center of our imagination. If some mystery about the man still remains after reading Michaelis's sharp, engaging, and level-headed biography that's no fault of the biographer--in fact, it's to his credit. Michaelis parses Schulz's particular combination of Midwestern reserve and steely determination and the strip's still-surprising bal ance of exuberance and misery, and he reminds us what a colossal cultural force it became, especially in the 1960s. But even as he ingeniously finds sources for Schulz's four-panel vignettes in the events of his biography, he recognizes that the true, sometimes inexplicable drama of his life took place when he sat down every day for 50 years to trace Linus's wobbly strands of hair, fill in Snoopy's black nose, and, time and again, letter the words "Good grief." --Tom Nissley