Discussion

Explanation:

Let the Arithmetic Mean of the 10 numbers be x and s be the sum of the remaining 9 numbers.

x+10a+b10=x ...(i)

Interchanging the number ab with ba,

x+10b+a10= x + 1.8 ... (ii)

Subtracting (i) from (ii), we get,

10b + a − (10a + b) = 9(b − a) = 18

b − a = 2

Hence, option (b).

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