If a 2-digit number 'ab' (a > b) is reversed to 'ba', what is the difference (ab - ba)?

Type: MCQ • Marks: 1

A. 9(a - b)

B. 9(a + b)

C. 11(a - b)

D. 10(a - b)

Explanation

ab - ba = (10a + b) - (10b + a) = 9a - 9b = 9(a - b). Always divisible by 9.

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Class 7th Ganita Prakash 1

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