Question

The sum of first and 21st terms of an arithmetic sequence is 140.
a) Find the sum of 6th term and 16th term.
b) what is the 11th term.
c) Find the sum of first 21 terms.
d) Find the sum of first 11 terms of the sequence 20, 25, 30.​

Answer 1

Answer:

c) Find the sum of first 21 terms.

Step-by-step explanation:

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Answer 2

Answer:

c) Find the sum of first 21 terms

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