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If a^2+b^2+c^2-a b-b c-c a=0\ t h e n\ a...

If `a^2+b^2+c^2-a b-b c-c a=0\ t h e n\ a : b : c` is `1:1:2` b. `1:1:1` c. `1:2:1` d. `2:1:1`

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RS AGGARWAL-RATIO AND PROPORTION-All Questions
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