TCS Company

A bo x co ntains 2 white balls 3 blac k balls and 4 red balls. I n how many ways can 3
balls be drawn fro m the box , if at least one blac k ball is to be included in the draw ?

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TCS Other Question
A well with 14 m inside diamet er is dug 10 m deep. Earth tak en out of it has been
evenly spread all around it to a w idth of 21 m to fo rm an embank ment. The height of
the embank ment is:
(a) 1/2 m (b) 2/3 m (c) 3/4 m (d) 3/5 m
 A 120 wire cable has been laid firmly undergr ound between two t elepho ne
exchanges located 10k m apart.
Unfortunately after the c able was laid it was discovered to be the wro ng type, the
problem is the individual wir es are not labelled. There is no visual way of knowing
whic h wire is whic h and thus co nnections at eit her end is not immediat ely possible.
You are a trainee technician and your boss has asked yo u to identify and label the
wires at both ends witho ut ripping it all up. You have no transpo rt and only a batt ery
and light bulb to test co ntinuity. You do have tape and pen for labelling the wires.
What is t he shortest dist anc e in k ilo met res you will need to walk to co rr ectly identify
and label each wir e?
(a) 17 (b) 15 (c) 10 (d) 20