A train crosses another train running in the opposite direction in 25 seconds. What is the speed of the train?

I. Both the trains are running at the same speed.

II. The first train is X cm long.

We need the length of the train also which is not given in the question.

In how many ways can a group of 2 boys and 2 girls be made out of a total of 6 boys and 4 girls?

In how ways can the selection be made so that a particular member is always excluded?

...In how many different ways can the letters of the word “DISCHARGE” be arranged in such a way that the vowels always come together?

What will be the number of permutations of n different things, taken r at a time, where repeatition is allowed?

Nine boys have to stand in a circle. In how many ways they are to be stand on the circumference of circle?

In how many ways a Cricketer can make a Double century with fours and Sixes only?

In how many different ways can the letter of the word ‘PRAISE’ be arranged?

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