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ICSE Class 10 Answered

Topic : GP

Q2. The sum of the first 3 terms of a GP is 1 and the sume of the next three terms is 27. Determine the first term, the common ratio and the sum of the GP.

Asked by Pankaj | 07 Oct, 2018, 07:05: PM
Expert Answer
let a,ar,ar2,ar3,.....be the terms
a+ar+ar2=1
a(1+r+r2)=1......(1)
2nd condition
ar3(1+r+r2)=27......(2)
 
r3=27.....from(1)
r=3
put in (1)
Answered by Arun | 08 Oct, 2018, 12:26: PM
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