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SabariGiri Residential School
"Smartindia is the best online tool for school students." Ms Deepa Chandran, Principal Anchal
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If 7a+8b:7c+8d = 7a-8b:7c-8d , prove that: (i) a:b = c:d (ii) 4a-5b:4c-5d = 3a+4b:3c+4d |
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