Question

If the sum of n terms is (5/2)n^2+ 3n/2 then sum of its 10 terms is
(a) 250
(b) 230
(c) 225
(d) 265

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

Sn = (5/2)n² + 3n/2

Sum of its 10 terms -

S(10) = (5/2)(10)² + 3(10)/2

= 5/2 * (100) + 30/2

= 5*50 + 15

= 250 + 15 = 265