- A19th
- B20th
- C21st
- D22nd
Step-by-Step Solution
a = 90, d = -6. -30 = 90 + (n - 1)(-6) gives -120 = -6(n - 1), so n - 1 = 20 and n = 21. The value 20 is only n - 1, the number of steps taken, not the term number.
Answer: C) 21st
Which term of the AP 90, 84, 78, 72, ... is -30?
Class 10nth Term of an APAlgebra — Sequences
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