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If p be any odd natural number, greater ...

If p be any odd natural number, greater than 3 then which digit will never appear as the last digit in the product of `(p^2 - 1)(p^2 + 1)` is :

A

9 and 7

B

5 and 3

C

1 and 5

D

all of these

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The correct Answer is:
D
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