Factorial

Q) If N = 1! – 2! + 3! – 4! +…..+ 23! – 24! + 25!, then what is the unit digit of N2524?
(a) 9
(b) 1
(c) 7
(d) 0


Q) N = 40! × 39! × 38! × ….. 3! × 2! × 1!
Which of the following represents the 152nd digit from the right end of N?

(a) 0
(b) 1
(c) 5
(d) 6

Q) Find the value of 0!(12+1-1) + 1!(22+2-1) + 2!(32+3-1) + 3!(42+4-1) + …………+ 35!(362+36-1)
(a) 37! + 36! – 2
(b) 37! + 35! – 2
(b) 37! + 35! – 1
(b) 37! + 36! – 1

 

Q) Which of the following has the maximum value?
(a) 33!
(b) 10!*13!
(c) 12!*11!
(d) 30!*3!

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