Gp Sum Terms
1. The problem states we have a geometric progression (GP) starting with 2, 6, 18, 54, ... and we want to find how many terms are added to get a sum of 19682.
2. Identify the first term $a = 2$ and the common ratio $r = \frac{6}{2} = 3$.
3. The sum of the first $n$ terms of a GP is given by the formula:
$$ S_n = a \frac{r^n - 1}{r - 1} $$
4. Substitute the known values:
$$ 19682 = 2 \frac{3^n - 1}{3 - 1} = 2 \frac{3^n - 1}{2} $$
5. Simplify the equation:
$$ 19682 = 3^n - 1 $$
6. Add 1 to both sides:
$$ 19682 + 1 = 3^n $$
7. So,
$$ 19683 = 3^n $$
8. Recognize that $19683 = 3^9$ because $3^9 = 19683$.
9. Therefore,
$$ n = 9 $$
10. The number of terms added to get the sum of 19682 is 9.