Question

sum of 15th and 16th terms of an arithmetic sequence is 200.

a) What is the sum of 1st and 30th terms?

b) Find the sum of first 30 terms if its 10th term is 78.

c) Find 21st terms

d) Find the common difference

e) Write it's algebraic form
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Answer 1

Answer:

jskkaka

Step-by-step explanation:

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Answer 2

Answer:

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