exam Maths Puzzle Numerical Ability

In how many ways can a student work 7 out of 10 questions on an exam?

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exam Other Question

can someone please help me solve and understand this division and simplify it?

-9-sqrt{{{108}}}/3
I am looking for the 95% confidence interval estimate of the true population for the following:


If the governor election were held today, would you vote for Martinez or Pajci