Calculating the Sum of the Series 3.6 4.7 5.8 upto (n-2) terms
The given series is:
3.6 4.7 5.8 ... upto (n-2) terms
Understanding the Given Series
The given series is an arithmetic progression with:
- First term (a) = 3.6
- Common difference (d) = 1.1
- Last term (l) = (n-2)d + a
Using the formula for the sum of an arithmetic progression, we can calculate the sum of the given series.
Formula for the Sum of an Arithmetic Progression
The formula for the sum of an arithmetic progression is:
(n/2)(2a + (n-1)d)
Calculating the Sum of the Given Series
Substituting the values of a, d, and l in the formula for the sum of an arithmetic progression, we get:
(n/2)(2(3.6) + (n-3)(1.1))
Simplifying the above expression, we get:
(n/2)(7.2 + 1.1n - 3.3)
(n/2)(1.1n + 3.9)
0.55n^2 + 1.95n
Therefore, the sum of the series 3.6 4.7 5.8 ... upto (n-2) terms is:
0.55n^2 + 1.95n