R-SAT Exam

The principal wants to arrange 5 students on the platform such that the boy Shyam occupies the second position and such that the girl Geetha is always adjacent to the girl Anitha. How many such arrangements are possible?
option
A. None
B. 7!*5!
C. 3!*5!
D. 3!*7!
E. 3!*2!

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R-SAT Other Question

If a number is cubed, which of the following number will be a unit digit ?
option
A. 5
B. None
C. 4
D. Any number from 0-9
E. 7
What is the value of 1*1! + 2*2! + 3!*3! + ............ n*n!, where n! means n factorial or n(n-1)(n-2)...1
A. (n+1)! B. (n+1)! - 1! C. (n+1)!* 1!