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If 8th term of an arithmetic progression is 31 and its 15th term is 16 more than 11th term of the arithmetic progression. What is the first term of that arithmetic progression?
  • a)
    4
  • b)
    3
  • c)
    -4
  • d)
    -3
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
If 8th term of an arithmetic progression is 31 and its 15th term is 16...
Let a be the first term and d be the common difference
a + 7d = 31
a + 14d = a + 10d + 16
a + 14d - a - 10d = 16
⇒ d = 4
∴ a = 31 - 7d = 31 - 28 = 3
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