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how do i increase my score in lr

There are 12 holes made in the ground. At least 3 are to be filled with a red ball and the other holes can be filled with any color ball. In how many different ways can all the holes be filled from a box of 5 red balls and 10 mixed color balls?

What is the sum of the products: 1*2*3; 2*3*4; ….; 50*51*52?

which digit from the right is the 1st odd digit in the no. 340^235?

how do u get to see solutions after giving dashcat?

what should I do ,to be good in numbers. I have solved the 1st slot of time material regarding numbers. but as I m attempting cat quotient or times sectional test on numbers my score is extremely bad.

How do i solve find the remainder questions? I didn't understand the concept of (mod).Please help :)

n ( > 4 ) kids are standing in a line one next to the other, such that everybody is facing north. How many kids are there? Statement 1: Number of ways in which 3 kids can be selected such that no two selected kids are standing next to each other is 10. Statement 2: If the kids are made to sit around a circular table such that one particular kid always occupies a specific seat, the number of such arrangements possible is 120.

It is powerplay quesn. In this question's answer, the answer given form 1st statement is : From statement 1: Let there be n kids in the line. The number of ways of selecting 3 of them such that the selected kids are not next to each other is n−2C3=10 => n-2 = 5 => n = 7. Can you elaborate ?

If a7! + b8! + c9! + d10! = x, where a, b, c and d are natural numbers that are not multiples of 10, then how many distinct values of unit’s digit of x are possible?

I can't increase my questions attempt rate. It's below 50 always. What will i do?(any suggestion)