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What is _(k=0)^28 -k^2- (28Ck), where is the number of ways of choosing k items from 28 items?

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ans is
406*2^27
11 years agoHelpfull: Yes(6) No(6)

didnt got the question
11 years agoHelpfull: Yes(3) No(1)
please provide detailed solution
11 years agoHelpfull: Yes(2) No(1)

TCS Other Question

Car A leaves city C at 5 pm and drives at a speed of 40 kmph. 2 hours later another car B leaves city C and drives in the same direction as car A. In how much time will car B be 9 km ahead of car A. Speed of car B is 60 kmph.
option
a) 4.25 hrs
b) 4.17 hrs
c) 4.30 hrs
d) 4.45 hrs n is a natural number and n^3 has 16 factors then how many factors can n^4 have?