Are there any variations below that could not be completed using pencil and paper? Here are possible variation: (a) Find the sum of all the multiples of 3 or 5 or 7 or 11 below 1000. (b) Find the sum of all the multiples of 3 or 6 or 18 below 1000. (c) Find the sum of all the multiples of 3 and 5 and 7 and 11 below 1000 . (d) Find the sum of all the multiples of 3 and 6 and 18 and 36 below 1000