यदि l + m + n = 9 और l^(2) + m^(2) +n^(2...

यदि `l + m + n = 9` और `l^(2) + m^(2) +n^(2) = 31` हो, तो `lm + mn + nl` का मान बातइए I

A

22

B

50

C

25

D

`-25`

Verified by Experts

The correct Answer is:

C

यदि l + m + n = 9 और l^(2) + m^(2) +n^(2) = 31 हो, तो lm + mn + nl का ...
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