exam Maths Puzzle Numerical Ability

Find the missing geometric sequence 15, , 81,...
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Find the missing geometric sequence 36, , 100, ...
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exam Other Question

A sample of 26 is selected from the population. What is the number of degrees of freedom used to determine the appropriate critical t-value?
A) 20
B) 19
C) 24
D) 25
E) None of the above frederique is two years older than her brother. 12 years ago she was twice as old as he was. How old are they now?