If 1 + m + n = 9 and 1 ^(2) + m ^(2) + n...

If `1 + m + n = 9 and 1 ^(2) + m ^(2) + n ^(2) = 31,` then the value of `lm + mn + nl` wll be

A

22

B

50

C

25

D

`-25`

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The correct Answer is:

C

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