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there r 12 children youngest is aboy. find probability of remaining childrens r boys

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after the typist writes 12 letters n addresses 12 envelopes she inset into the envelope (1 letter /envelope).what is the probability thatexactly 1 letter is inserted in an improper envelope Anoop managed to draw 3 circles of equal radii with their centres on the diagonal of a square such that the two extreme circles touches two sides of the square and each middle circles touches two circles on either side.find the ratio of the side of the square to radius of the circles.you may assume square root of 2 is 1.4.