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Relative question

In permutations and probability test 1, why is answer (2*8!) and not (2*7!).

Respected Sir,

please explain me cubes concept in CAT portion briefly...i.e; about painted cubes...

Are all topics related to CAT covered in videos, mainly QUANT.??? I feel my weaker section is QUANT so i just want to make sure if they are and whom do i consult if i have doubts??

find out the hcf of 0.11, 0.121, 0.1331

Five bells beginning together toll at interval 4,5,7,8,10 seconds respectively. After what interval of time will they toll together again ?

the product of two number is 12960 and their hcf is 36. how many such pairs can be formed

maxima minima in Venn diagram please explain in detail please i wasted a day to understand but could not satisfy myself with the doubts i have .

Thank you . I appreciate the help rendered by you in advance .

icet