#Learn mathematics;2+3=1puzzle;Can you solve this?#puzzle#reasoning

Can You Solve This? 6div2(1+2)=

Directions : In the following questions, four alternatives are given for the Idiom/Phrase printed in bold in the sentence. Choose the alternative which best expresses the meaning of the Idiom/ Phrase. You have been trying to solve this puzzle for a long time, be careful so that you avoid barking up the wrong tree

A problem in mathematics is given to 3 students whose chances of solving it are (1)/(2);(1)/(3);(1)/(4) .What is the probability that the problem is solved?

A can solve 75% of the problems in a book on mathematics and B can solve 70%. What is the probability that a problem chosen at random is solved?

A problem in mathematics is given to 4 students whose chances of solving individually are 1/2, 1/3, 1/4 and 1/5 . The probability that the problem will be solved at least by one student is