Which of the following groups of forces co

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Which of the following groups of forces could be in equibrium

A

$3\, N, 4\, N, 5 \,N$

B

$4\,N, 5 \,N, 10 \,N$

C

$30\,N, 40 \,N, 80 \,N$

D

$1\,N, 3\, N, 5\, N$

Which of the following groups of forces could be in equibrium

For equilibrium of forces, the resultant of two (smaller) forces should be equal and opposite to third one.