In a geometric series, if the first term is 4 and the common ratio is 3, what is

Practice Questions

Q1
In a geometric series, if the first term is 4 and the common ratio is 3, what is the 4th term?
  1. 108
  2. 81
  3. 64
  4. 48

Questions & Step-by-Step Solutions

In a geometric series, if the first term is 4 and the common ratio is 3, what is the 4th term?
  • Step 1: Identify the first term of the geometric series, which is given as 4.
  • Step 2: Identify the common ratio of the geometric series, which is given as 3.
  • Step 3: Determine which term we want to find. In this case, we want the 4th term.
  • Step 4: Use the formula for the nth term of a geometric series, which is a_n = ar^(n-1).
  • Step 5: Substitute the values into the formula: a_4 = 4 * 3^(4-1).
  • Step 6: Calculate the exponent: 4 - 1 = 3, so we have a_4 = 4 * 3^3.
  • Step 7: Calculate 3^3, which is 27.
  • Step 8: Multiply 4 by 27 to find the 4th term: 4 * 27 = 108.
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