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CBSE XII
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Model Papers
Show that of all the rectangles with a given perimeter,the square has the largest area.
cbse
class12
modelpaper
2012
sec-c
q29
math
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asked
Jul 25, 2013
by
sreemathi.v
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Show that of all the rectangles of given area, the square has the smallest perimeter.
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A catering agency has two kitchen to prepare food at two places A and B. From these places 'Mid-day Meal' is to be supplied to three different schools situated at P, Q , R. The monthly requirement of the school are respectively 40,40 and 70 food packets. A packet contains lunch for 1000 students. The capacity of kitchen A and B are 60 and 70 packets per month respectively. The transportation cost per packets from the kitchens to school is given below : How many packets from each kitchen should be transported to school so that the cost of transportation is minimum? Also find the minimum cost.
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In an examination, 10 questions of true-false type are asked. A student toses a fair coin to determine his answer to each question. If the coin falls heads, he answers 'true' and if it falls tails, he answers 'false'. Show that the probability that he answers at most 7 questions correctly is \( \frac{121}{128} \).
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