The sum of 6th and
a) what is the sum of first and 21th terms of this sequence?
b) If the 10th term term is 32,find its common difference?
What is the sum of first 21 terms of this sequence?
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→ @ ). Answer: the answer is 70
→ b ) First term of the sequence is 10 and common difference is 3.
a
1
= 10 and d = 3
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