The operation @ is defined for all integers x and y as x @ y=xy-y. If x and y are positive integers, which of the following cannot be Zero?

Anik travels 35 kilometers (km) partly at 4km /h and partly at 5 km/h. If he covers the distance at 5 km/h he...

Kalam bought two varieties of rice , costing Tk. 50 /kg and Tk. 60 /kg each , and mixed them in some ratio. Th...

In a class, 120 students are male and 100 students are female , 25% of the male students and 20% of the female...

is divisible by both 40 and 75 if a has exactly three distinct prime factors, which of the following could be...

There are 48 books on 3 shelves. If 3 books from third shelf are shifted to the second there will be same numb...

Arafat has TK. 420. He purchased fifty mangoes and thirty oranges with the whole amount. He then chose to retu...