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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Sequence and Series
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If 1 , 3 , 8 are first three terms of an arithmetic - geometric progression (with +ve common difference ) , the sum of next three terms is :


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Answer : (a) 180
Explanation : Given , a=1
Subtracting (1) from (2)
Next three terms ,
$(1) \quad\; (1+3d)\;r^3 =(1+\large\frac{3}{2})\;8=20$
Sum of next three terms = $\;20+48+112=180\;.$
answered Jan 23, 2014 by yamini.v

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