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In an exam there are total 12 questions. From the first 4 questions a student has to answer 2 questions which are compulsory. And he has to answer 5 from the rest. In how many ways he can answer questions.

Read Solution (Total 5)

336
4C2*8C5=336
13 years agoHelpfull: Yes(15) No(2)

the correct ans is 4C2*8C5=336 because this is the AND situation not the OR situation.
13 years agoHelpfull: Yes(5) No(1)
2 ques can be choosen from first 4 in 4c2 ways
5 ques can be choosen from remaining 8 in 8c5 ways
as they are independent
4c2*8c5
13 years agoHelpfull: Yes(5) No(0)
4c2 + 8c5 = 62 (6+56)
13 years agoHelpfull: Yes(3) No(4)
4C2+8C5=12+56=68
13 years agoHelpfull: Yes(1) No(11)

TCS Other Question

Tarun is standing 2 steps to the left of a green mark and 3 steps to the right of a black mark. He tosses a coin. If it comes up heads, he moved one step to the right, otherwise he moves one step to the left. He keeps doing this until he reaches one of the two marks, and then he stops. At which mark does he stops? A: he stops at 21 coin tosses. B: he obtains three more tails than heads. For school children a software was designed.In that software one monkey has to choose balloons. If a monkey chooses 2 at a time and continues picking then 1 baloon is left. If it picks 5 at a time then the remaining is zero,if it picks 6 at a time then remaining is 3. What is the minimum number of balloons?