MBA Exam

A box contains 5 distinct pair of black shoesand 10 identical piars of brown shoes. The minimum number of shoes to be taken out from the box to be absolutely certain of getting a pair of shoes is

1) 6
2) 16
3) 21
4) 3

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MBA Other Question

If f(x)=f(x-1)f(x+1) and f(0)=1/3 and f(5)=1/6, then f(1+2+3+......+100)=?

1) 1/3
2) 1/2
3) 1/3*1/6*1/9*.....*1/300
4) 1/3*1/4*1/5......*1/103
in how many ways two people can be arranged to sit on three chairs??approach please,,m quite confused in basic of this....

1) 2^3
2) 3^2
3) 6
4) none