Learn to Create a Robotic Device Using Arduino in the Free Webinar. Register Now
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-1023-196
+91-120-4616500
CART 0
Use Coupon: CART20 and get 20% off on all online Study Material
Welcome User
OR
LOGIN
Complete Your Registration (Step 2 of 2 )
Free webinar on Robotics (Block Chain) Learn to create a Robotic Device Using Arduino
30th Jan @ 5:00PM for Grade 1 to 10
A student has to answer 10 questions choosing at least 4 from each of part A and B. If there are 6 questions in part A and 7 in part B then in how many ways can a student choose 10 questions? i know the usual approach to solve this question by making cases.. i want to know what am i doing wrong in this 6C4 x 7C4 x 5C2 first i did 4 ques from 6 of part A den 4 of 7 from B and den 2 from any remaining 5?? A student has to answer 10 questions choosing at least 4 from each of part A and B. If there are 6 questions in part A and 7 in part B then in how many ways can a student choose 10 questions?i know the usual approach to solve this question by making cases.. i want to know what am i doing wrong in this 6C4 x 7C4 x 5C2first i did 4 ques from 6 of part A den 4 of 7 from B and den 2 from any remaining 5??
see make 3 cases , in this way this problem becomes much simpler,part A : 4 and part B : 6part A : 5 and part B : 5part A : 6 and part B : 4sher mohammadb.tech, iit delhi
The question makes 3 cases...1) When 4 questions are chosen from A and rest 6 from B2) When 5 questions are chosen from A and rest 5 from B3) When 6 questions are chosen from A and rest 4 from BThis makes the answer...(6C4×7C6) + (6C5×7C5) + ( 6C4× 7C6)This makes the answer...105+126+35= 266 ways
Post Question
Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians.
points won -