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GATE Civil Engineering (CE) 2023 Shift 1 Solved Paper

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Question : 5

Total: 65

A line of symmetry is defined as a line that divides a figure into two parts in a way such that each part is a mirror image of the other part about that line.
The figure below consists of 20 unit squares arranged as shown. In addition to the given black squares, upto 5 more may be coloured black. Which one among the following options depicts the minimum number of boxes that must be coloured black to achieve two lines of symmetry? (The figure is representative)

d
c, d, i
c, i
c, d, i, f, g

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