TCS Company Logical Reasoning General Mental Ability

please give me a puzzle

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looo puzzle.....kush :P
8 years agoHelpfull: Yes(1) No(0)

21*8=168 8 16 is carry
20*8=160+16=176 6 17 is carry
19*8=152+17=169 9 16 is carry and so on
ans=968
9 years agoHelpfull: Yes(0) No(0)

TCS Other Question

Two vertical poles 2 meter and 8 meter high stand apart on a horizontal plane. find the height in meters of the point of intersection of the lines joining the top of each pole to the bottom of the other pole.
a.1.8 b.Cannot be determined without knowing the distance between bottom of the pole c.1.6 d.5.6 8+88+888+.....+8888........8888. There are 21 “8” digits in the last term of the series.
Find the last three digits of the sum.