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(a) Find the sum of first 20 numbers.
(b) What is the average of the first 20 numbers?
Notes to students:
1. If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12
2. Round your answer off to 2 decimal places