ICSE Class X Math 2020 Solved Paper

Question : 15 of 29

Marks: +1, -0

The

4^{\;\text "th "\;}, 6^{\;\text "th "\;}

and the last term of a geometric progression are 10, 40 and 640 respectively. If the common ratio is positive, find the first term, common ratio and the number of terms of the series.

Solution:

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