sir, please help

If f(x) = (x-1)/(x-2), what is f invesrse (4) ?

In the expansion of (x - √x - 7)^7, what is the coefficient of x^(5/2)?

oh, I did not notice it before. Thankyou!

Hi sir, this is a question from CopyCat-3My doubt is-- S(n) gives the sum of k and not digital sum, right? Had it been digital sum, then S(555) were e...

Sir, how do we eliminate option C in the above options?

A box contains 5 chips, numbered from 1,2,3,4 and 5. Chips are drawn randomly one at a time without replacement until the sum of the values drawn exce...

Sir, how do we know that A,B,E,D are concyclic points (as mentioned in the solution)?

Four circular tables are arranged such that their centers from a square. If each table can accommodate 4 persons, in how many ways can 16 people be se...

In two alloys, respective ratios of copper and zinc are 4 : 1 and 1 : 3. Ten kg of the 1st alloy, 16 kg of the 2nd alloy and some quantity of pure cop...