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What is the sum of first 20 natural. num...

What is the sum of first 20 natural. numbers?
b) Find the sum of .first 20 terms of 4,8 , 12,....
c) If 3 is added to each term in the above sequence, write down the algebraic expression of the new sequence.
d) Find the sum of first 20 terms of the new sequence.

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