Mathematics
ab and ba are two 2-digit numbers then ab + ba is equal to :
2ab
11ab
11(a + b)
none of these
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Answer
ab + ba
= (10 x a + b) + (10 x b + a)
= 10a + b + 10b + a
= (10a + a) + (b + 10b)
= 11a + 11b
= 11(a + b)
Hence, option 3 is the correct option.
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