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The sum of the series 3.6+4.7+5.8+.upto (n-2)terms?
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The sum of the series 3.6+4.7+5.8+.upto (n-2)terms?
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
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The sum of the series 3.6+4.7+5.8+.upto (n-2)terms?
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