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how to solve this type equation

Do we get solutions for the DASHCAT's attempted?

how to improve reasoning part

what is diff between while and when

Out Of 75 people, 25 can do swimming, 38 can do cycling, 27 can play badminton and 16 can play exactly 2 of the three sports and 5 can play none of the sports. How many people can play at most one sport?

A] 57 B] 52 53 D] Can’t be determined

can anyone help me in understand concepts of allegations and mixtures in an easy way ?

how do i solve number series questions ?

4 octagonal die(faces 1-8) are thrown together. what is the total number of ways in which the sum of the numbers obtained  on the dice is 25??

In averages test 1, question 5, it is mentioned yearly average as 13.9%. but when it is calculated for 3 consecutive years as mentioned in the question it is not matching the actual value. i think the answer should be 12.3%. Kindly help.

3^0+3^1+3^2+--------------3^206 ÷13 what is the remainder?
In the solution it is written that above statement can be written as(3^207-1/2) but how??