Option 4 : 115

Free

Polity

35392

10 Questions
10 Marks
8 Mins

**Given**

\(S = \sum^{10}_{n=1}(2n + \frac{1}{2})\)

**Calculation**

\(S = \sum^{10}_{n=1}(2n + \frac{1}{2})\)

= 2.5 + 4.5 + 6.5 + ... + 20.5

= 10/2 (2.5 + 20.5) [S_{n} = n/2(a + l)]

= 5 × 23

= 115

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