find the sum of 10 terms of an a.p -0.5,-1,-1.5,.......

Asked by vinitha123 | 2nd Jan, 2010, 11:10: AM

Expert Answer:

d = (-1) - (-0.5) = -0.5

Sn = n(2a+(n-1)d)/2

S10 = 10(2(-0.5)+(9)(-0.5))/2

= -55/2

= -27.5

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TopperLearning.

Answered by  | 2nd Jan, 2010, 12:10: PM

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