priyanka patel
1 year, 5 months ago

how do we solve questions regarding find the number of triangles with barely any information given

Sonali Patni
1 year, 5 months ago

remainder theorem

Pv Aaditya
0 Likes Posted 1 year, 5 months ago

Hi Sonali, any specific questions on Remainder Theorems?

Check out our concepts on Number Systems/Remainder Theorems here:

https://cracku.in/cat/quant-and-di/number-systems

https://cracku.in/cat/quant-and-di/number-systems/cheatsheet

Priyanka Mehta
1 year, 6 months ago

a fair coin is tossed 10times .find the probability that two heads do not occur consecutively

Ranbir Kapoor
0 Likes Posted 1 year, 5 months ago

10 Tails - 1/(2^10)

9T 1 H - (10C1)/(2^10) = 10/(2^10)

8T 2H - (9C2)/(2^10) = 36/(2^10)

7T 3H - (8C3)/(2^10) = 56/(2^10)

6T 4H - (7C4)/(2^10) = 35/(2^10)

5T 5H - (6C5)/(2^10) = 6/(2^10)

Total = 1+10+36+56+35+ 6/(2^10)

=144/(2^10) = 9/64

Priyanka Mehta
1 year, 6 months ago

in a room there are 7 persons. The chance that two of them were born on the same day of the week.

Praneeth Madhunanthu
0 Likes Posted 1 year, 5 months ago

Exactly two were born on the same day:

Let's find the numerator first. Numerator is the total number of favorable events.

We can select 2 persons from 7 persons in $$^7C_2$$ ways and 1 day from the seven days in 7 ways => $$^7C_2$$ * 7

There are 5 persons remaining and 6 days remaining. Each of them was born on a different day.

So, we can select 5 days from 6 days in $$^6C_5$$ ways and arrange the 5 persons in them in 5! ways => $$^6C_5$$*5!

Total number of favorable events = $$^7C_2$$ * 7 * $$^6C_5$$*5!

Total number of events = $$7^7$$

Probability required = $$\frac{^7C_2 * 7 * ^6C_5 * 5!}{7^7}$$

sahil jain
1 year, 6 months ago

How do we solve triangular graphs problem?

Pv Aaditya
0 Likes Posted 1 year, 5 months ago

Hi Sahil, the best way is to draw the graph in case you are solving questions on areas.

Pulkit Jain
1 year, 6 months ago

Q4 in AP,GP,HP. I have commented my answer. Please let me know if that's correct

Pv Aaditya
0 Likes Posted 1 year, 5 months ago

Hi Pulkit, thanks for your comment. Let's continue the discussion on that same thread.

Priya Singh
1 year, 6 months ago

find the number of ways in which 5 men can watch 4 movies such that each movie is watched by 1 one person

udita bali
1 year, 6 months ago

how do i solve percentage questions

Pv Aaditya
0 Likes Posted 1 year, 5 months ago

Hi Udita, the best way to solve percentage questions is to reduce them to fractions and then form equations based on the conditions given. The equations thus formed are generally linear or quadratic and can be easily solved. Finally, convert the fractions into percentages to get the answer.

NOVAROON OJAH
1 year, 6 months ago

Are the DASHCAT 18 solutions going to be made available any time soon?

suchita jadhav
1 year, 6 months ago

how to solve setting arrengment problem

Pv Aaditya
0 Likes Posted 1 year, 5 months ago

There is no one best way to solve Seating Arrangement problems but one good way to solve is to try to start from the piece of information that gives rise to the least number of possibilities. From this, include the information provided by all the other clues. One has to be careful about all the possibilities because many Seating Arrangement questions include the option 'Cannot be determined'.

140 points

56 points

52 points

46 points

28 points

Hi Priyanka, is the question about finding the number of triangles when a larger triangle is divided by a number of lines? If that is the case, generally there is a pattern for triangles of each size. Try to find that pattern instead of trying to count the number of triangles individually. This will make it easier.