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Question 1 (iii)
Find the sum of the following APs
(iii)
0.6, 1.7, 2.8 ,…….., to 100 terms


Solution

(iii)
0.6,1.7,2.8,,to 100 termsFor this A.P.,a=0.6d=a2a1=1.70.6=1.1n=100We know that,Sn=n2[2a+(n1)d]S100=1002[1.2+(99)×1.1]=50[1.2+108.9]=50[110.1]=5505

Mathematics
NCERT Textbook
Standard X

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