The sum of 8 th and 9 th terms of an arithmetic sequence is 32
a) What is the sum of its first and 16 th terms ?
b) What is the sum of first 16 terms of this sequence ?
c) If the 11 th term of this sequence is 21 , what is its 6
th term ?
d) What is its common difference ?
e) What is its algebraic form ?
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