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Question

The perimeter of a triangle with sides 3i+4j+5k,4i3j5k and 7i+j

A
450
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B
150
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C
240
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D
210
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Solution

The correct option is A 450
Perimeter=3i+4j+5k+4i3j+5k+7i+j
=9+16+25+16+9+25+49+1
=50+50+50
=350
=50×9=450

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