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3. Find the sum of the first 20 natural numbers. 4. If the first n terms of the sequence : 9, 12, 15, 18,... are
3. Find the sum of the first 20 natural numbers. 4. If the first n terms of the sequence : 9, 12, 15, 18,... are added, how many terms give a sum of 126? 5. Find the sum of the integers between I and 70, and are divisible by 3. 6. The sum of the first 15 terms of an arithmetic sequence is 765. If the first term is 23, what is the common difference
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