book Maths Puzzle Numerical Ability

A bag contains 7 apples and 5 oranges. If you select 6 pieces of fruit without looking, how many ways can you get six apples?

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book Other Question

How do you find the domain and the range of funtions like this??
1){{{ (x-5) / (18-3x-x^2) }}}
or
2) {{{ 3sqrt( -3-x ) }}}
Dear tutor,

having trouble. What is radius or diameter of 36" circumference circle?

Thanks,

George Mooney