Latest IBM Aptitude Question SOLUTION: The unit digit in the product (784 x 618 x 917 x 463) is: A. 2 B. 3 C. 4 D. 5

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The unit digit in the product (784 x 618 x 917 x 463) is:
A. 2 B. 3
C. 4 D. 5

Asked In IBM (12 years ago)

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Mylammal  (9 years ago)

4*8=2*7=4*3=2
Ans:2

Is this solution Helpfull? Yes (3) | No (1)  

ARADHANA REDDY  (9 years ago)

Unit digit in the given product is obtained by multiplying
4*8*7*3=2
2 is the answer

Is this solution Helpfull? Yes (3) | No   

SRI HARSHA  (11 years ago)

et, side of original plate be =x
also, side of the square at the corners= a
so, when the square at the corner is cut off, the length of the box is=x-2a
similarly, the breadth of the box is=x-2a
the height of the box would be invariably=a
so, the dimension of the open box=(x-2a)*(x-2a)*a=a*(x-2a)^2
so, we need to factorize 128 so that we get a square term & an integer.
case 1. 128=2*2*2*2*2*2*2=(2*2*2*2*2)*2*2=32*2*2
so, a=32, x-2a=2, x=2*32+2=66
case 2. 128=2*2*2*2*2*2*2=(2*2*2)*(2*2)*(2*2)=8*4*4
so, a=8, x-2a=4, x=2*8+4=20
case 3. 128=2*2*2*2*2*2*2=2*(2*2*2)*(2*2*2)=2*8*8
so, a=2, x-2a=8, x=2*2+8=12
so, the possible values of the side of the original square plate are 66, 20 & 12
none of these match the answer options provided in a. , b. or c.
so, the correct choice is d. or none

Is this solution Helpfull? Yes (1) | No (13)  

uthra murugesan  (8 years ago)

http://www.indiabix.com/aptitude/numbers/001013

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Archit Jain  (6 years ago)

multiply unit digits: 4x8x7x3
A.2

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