If the first term of an arithmetic series is 5 and the common difference is 3, w

Practice Questions

Q1
If the first term of an arithmetic series is 5 and the common difference is 3, what is the 15th term?
  1. 44
  2. 45
  3. 43
  4. 42

Questions & Step-by-Step Solutions

If the first term of an arithmetic series is 5 and the common difference is 3, what is the 15th term?
  • Step 1: Identify the first term of the arithmetic series, which is given as 5.
  • Step 2: Identify the common difference, which is given as 3.
  • Step 3: Identify the term number we want to find, which is the 15th term (n = 15).
  • Step 4: Use the formula for the nth term of an arithmetic series: a_n = a + (n-1)d.
  • Step 5: Substitute the values into the formula: a_n = 5 + (15-1) * 3.
  • Step 6: Calculate (15-1) which equals 14.
  • Step 7: Multiply 14 by the common difference (3): 14 * 3 = 42.
  • Step 8: Add this result to the first term: 5 + 42 = 47.
  • Step 9: The 15th term of the series is 47.
  • Arithmetic Series – An arithmetic series is a sequence of numbers in which the difference between consecutive terms is constant, known as the common difference.
  • Formula for the nth term – The nth term of an arithmetic series can be calculated using the formula a_n = a + (n-1)d, where 'a' is the first term, 'd' is the common difference, and 'n' is the term number.
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