79.Which of the following is a unit that of force and why? 1.Nm 2.mN 3.nm 4.Ns

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Let n(A) = m and n(B) = n. Then the total number of non-empty relations that can be defined from

A to B is
(a) mⁿ
(b) n^m − 1
(c) mn − 1
(d) 2^mn − 1

4 m^{4} n^{4} - 8 m^{3} n^{4} + 6 m n^{3}

3^{n}

1.	SI unit of force	....................
2.	The force with which the Earth pulls us	....................
3.	The force between electrical charges	....................
4.	A force that attracts iron and nickel objects	....................

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