CBSE Class 10 Answered
find the sum of 10 terms of an a.p -0.5,-1,-1.5,.......
Asked by vinitha123 | 02 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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Answered by | 02 Jan, 2010, 12:10: PM
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