TCS Company

how many way we can distribute 10 identical looking pencils to 4 students so that each student get at least 1 pencil option(a)5040(B)210(c)84(d)none of these

Read Solution (Total 5)

In a partition formula of permutation if n identical items are distributed in r parts so formula is n+r-1Cr-1
but when given each get atleast one then formula is n-1Cr-1
so ans is 9C3=84
12 years agoHelpfull: Yes(35) No(6)

ANS:210
out of 10 4 is distributed to students, so 6 is remaining
now, we will distribute remaining 6 pencils to 10 students in 10C6 ways
=10C4= (10*9*8*7)/(4*3*2*1)=210
12 years agoHelpfull: Yes(4) No(15)
ans is c) 84....
12 years agoHelpfull: Yes(2) No(4)
ans =210
because 10 can be permuted among 4 by 10c4= 210
12 years agoHelpfull: Yes(0) No(7)
ANS:210 THAT IS 10C4=210
12 years agoHelpfull: Yes(0) No(4)

TCS Other Question

drawer hold 4 red hat and 4 blue hat.what is probabilty of getting exactly 3 red hatexactly 3 blue hatwhen taking 4 hat randomly out of drawer when immediately returning every haTto drawer before taking out of nextoption(a)1/2(b)1/8)(c)1/4(c)3/8) a turtle crossing the field.what is total distance passed by a turtle?consider two following statements X average speed of turtle 2m/min.y had turtlewalked 1 m/min faster than his average it would have been finished 40 mintue earliar.(1)A statement alone is sufficient(2)both statement x and y are needed(3)y is sufficint(4)both are not sufficint