Four identical planks each of length 'a'
are arranged one above the other over
a table as shown. Each projects a dis-
tance beyond the edge of the one that
is below it. Maximum value for 'L' so that
no block topples is
A) a/2 B) 3a/4 C) 25a/24 D) 11a/12
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the answer is (a)....................
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