to apply border to current cell
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SHIFT + CTRL + 7
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SHIFT + 7
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ALT + 7
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CTRL + 7
A
Correct answer
Explanation
SHIFT + CTRL + 7 in Excel applies borders to selected cells using the last-used border style, or removes borders if already present. This shortcut is specific to Excel and works with the bottom border by default. The 7 key was chosen for its visual similarity to a corner bracket.