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Each half-life reduces the substance to half. In 15 hours, there are three half-lives (15 ÷ 5). So the remaining amount is: (1/2)³ = 1/8 Hence, 1/8 of the substance remains after 15 hours.
Option figures:
Three of the following four figure pairs are alike in a certain way and thus form a group. Which is the one that does not belong to that group?
...Select the figure which will come next in the following figure series.
Study the given pattern carefully and select the number that can replace the question mark (?) in it.
How Many Triangles are there in the given figure?
Select a figure from amongst the Answer Figures.
Which figure is different from the rest?
Select a figure from amongst the Answer Figures.
