4. To find the product of three numbers 6, 7 and 8, we can have three ways. i. We may first multiply 6 and 7 to get 42 and then multiply it by 8 to get the product 336 ii. We may first multiply 7 and 8 to get 56 and then multiply it by 6 to get the product 336. iii. We may first multiply 6 and 8 to get 48 and then multiply it by 7 to get the product 336. This can be done for any three numbers. This property is known as associativity of multiplication of numbers. Express this property in a general way by using variables a, b and c.