- A-2
- B2
- C-5
- D1
Step-by-Step Solution
Common difference d = (55 − 25)/(20 − 10) = 3. From a + 9d = 25, a = 25 − 27 = −2.
Answer: A) -2
In an arithmetic progression, the 10th term is 25 and the 20th term is 55. Find the first term.
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