- A−2
- B2
- C−5
- D1
Step-by-Step Solution
From a + 9d = 25 and a + 19d = 55, subtracting gives 10d = 30, so d = 3. Then a = 25 − 9(3) = −2.
Answer: A) −2
In an arithmetic progression, the 10th term is 25 and the 20th term is 55. The first term is:
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