add (i) 2 a + 6 b +8 c ; 16 a + 13 c+18 b
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Step-by-step explanation:
2 a + 6 b +8 c ; 16 a + 13 c+18 b
= 2a+16a+6b+18b+8c+13c
=18a+24b+21c Ans
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