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When any two natural numbers N1 and N2, ...

When any two natural numbers `N_1 and N_2`, such that `N_2 = N_1 + 2` are multiplied with each other, then which digit appears least time as a unit digit if `N_2 le 1000` ?

A

0

B

9

C

4

D

both (a) and (c)

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The correct Answer is:
B
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