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  • Check what the result would have been if Sundaram had chosen the numbers shown below. 2. 21

 Check what the result would have been if Sundaram had chosen the numbers shown below.

    Q2. 21

Answers (1)

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If the tens digit is larger than the ones digit (that is, a > b), then
(10a + b) – (10b + a) = 10a + b – 10b – a
= 9a – 9b = 9(a – b).
If the unit digit is larger than the tens digit (that is, b > a), he does:
(10b + a) – (10a + b) = 9(b – a).

here a = 2 and b = 1

21 - 12 = 9 = 9*1 = multiple of 9

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Pankaj Sanodiya

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