Mathematics Past Questions and Answers

A box contains balls numbered 1 to 20. Find the probability of selecting a multiple of 2 or 5.

A bag contains 7 yellow balls and 5 white balls. Two balls are selected without replacement. Find the probability that both are yellow.

A class has 24 boys and 16 girls. Two students are selected one after the other without replacement. Find the probability that both are girls.

Evaluate:<br/>\[<br/>\sin 30^\circ + \cos 45^\circ<br/>\]

Find the LCM of:<br/>\[<br/>14m^2n,\ 21mn^2,\ 28m^3n^2<br/>\]