Exercise 3

21.What is the remainder when 1723 is divided by 16 ?[Amcat]
A) 15
B) 6
C) 3
D) 1

Explanation:

22) (7)21 + (7) 22 + (7) 23+ (7)24 = N, then what is the remainder when N is divided by 25?
A) 2
B) 0
C) 24
D) 9

Explanation:

23) (3)111 + (3) 112 + (3) 113 + (3) 114 = N, then what is the remainder when N is divided by 40?
A) 0
B) 3
C) 9
D) 80

Explanation:

24) What is the remainder when 496 is divided by 5 ?
A) 0
B) 2
C) 1
D) 4

Explanation:

25) What is the remainder when the given series 1 ! + 2 ! + 3 ! + 4....100 ! is divided by 7 ?
A) 0
B) 5
C) 1
D) 3

Explanation:

26) What is the unit digit of the given series 1! + 2! + 3! + 4! + 5! +.....100!?
A) 0
B) 1
C) 2
D) 3

Explanation:

27) The last digit of the number obtained by multiplying the numbers 41 x 42 x 43 x 44 x 45 x 46 x 47 x 48 will be
A) 0
B) 8
C) 9
D) 2

Explanation:

28)The last digit of the number obtained by multiplying the numbers 352 x 358 x 773 x 444 x 451 will be?
A) 0
B) 8
C) 9
D) 2

Explanation:

29) What is the last digit of (2012)2012 ?
A) 2
B) 4
C) 6
D) 8