(1) closure law
(2) commutative law
(3) associative law
(4) None of the above
2. The interior angles of a polygon are in A.P. If the smallest angle be 120° and angles differ by 5°, then number of sides in polygon is
(1) 6
(2) 7
(3) 8
(4) 9
3. If a, b, c are rational numbers, thendistributive law for multiplication overaddition is
(1) a × (b + c) = (a × b) + c
(2) a + (b × c) = (a + b) × (a + c)
(3) a × (b + c) = (a × b) + (a × c)
(4) a + (b × c) = (a + b) × c
4.Additive identity of real numbers is
(1) 1
(2) 0
(3) –1
(4) None of these
3/16 (3) 5 (4) –1
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