Research Aptitu...

There are 5 letters and 5 directed envelopes. Find 'the number of ways in which the tetters can be pul into the envelopes so that all are not put in directed envelopes?

How many words, with or without meaning, can be formed using all letters of the word EQUATION, using each letter exactly once?

It is required to seat 5 men and 4 women in a row so that the women occupy the even places. How many such arrangements are possible?

Four books, one each in chemistry, Physics, Biology and Mathematics are to be arranged in a shelf. In how many ways can this be done?

The Probability of raining on day 1 is 0.2 and on day 2 is 0.3. What is the probat of raining on both the days?

A bag contains 5 red balls and 8 blue bans. It also contains 4 green and 7 black balls. If a ball is drawn at random, then find the probability that it is not green.

From a pack of 52 playing cards, two cards are drawn together at random. Calculate the probability of both the cards being Kings.

Rahul's mother is the only daughter of Monika’s father, how is Monika's husband related to Rahul

A is B’s sister, C is B’s mother, D is C’s father, E is D's mother. Then, how is A related to D

Given that (i) A is brother of B (ii) C is father of A (iii) D is brother of E (iv) E is daughter of B, then uncle of D is