Add the following:
$4 a b c, 5 b c a, 6 c a b, 7 a b$

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Solution

Add $4 a b c, 5 b c a, 6 c a b, 7 a b$ :
Given, $4 a b c, 5 b c a, 6 c a b, 7 a b$
To add two or more terms, group the like terms and add each group of like terms separately.
So, we have
$4 a b c + 5 b c a + 6 c a b + 7 a b = 4 a b c + 5 a b c + 6 a b c + 7 a b = [4 a b c + 5 a b c + 6 a b c] + 7 a b = [4 + 5 + 6] a b c + 7 a b = 15 a b c + 7 a b$
Hence, the required answer is $15 a b c + 7 a b$ .

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