write a formula or formulae for the nth term sn for each of the following sequence
(c) 1, 3, 6, 10, 15, .........
Answers
Answered by
0
Answer:
21
Step-by-step explanation:
As we are skipping once then twice then thrice and so on.....
so I got the answer that is, 21
Answered by
3
Answer:
plz follow me plz
Step-by-step explanation:
Well, when I see a sequence like that, I want to first look at how the difference changes, and make that its own sequence. In this case, the difference goes as the following:
1, 2, 3, 4, 5, 6, 7…
Note: From now on, sequence will refer to the one I just wrote, and sum will refer to the sequence in your question.
This is the classic sequence of natural numbers, so you’re looking at the sum of the first n natural numbers. Now, there are two ways to go about solving this:
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