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

• 4*8=2*7=4*3=2
  Ans:2
• 9 years agoHelpfull: Yes(3) No(1)
• Unit digit in the given product is obtained by multiplying
  4*8*7*3=2
  2 is the answer
• 9 years agoHelpfull: Yes(3) No(0)
• 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
• 11 years agoHelpfull: Yes(1) No(13)
• http://www.indiabix.com/aptitude/numbers/001013
  
• 9 years agoHelpfull: Yes(0) No(1)
• multiply unit digits: 4x8x7x3
  A.2
• 7 years agoHelpfull: Yes(0) No(0)