Find the nth term and the indicated term of the arithmetic sequence {an} whose initial term, a, and common difference, d, are given.a1 = 
; d = 
an = ?; a21 = ?
A. an = 
n + 
; a21 = 22
B. an = 
n; a21 = 21
C. an = - 
n; a21 = - 21
D. an = 
n - 
; a21 = 20
Answer: B
Mathematics
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