Email
Chat with tutor
logo

Ask Questions, Get Answers

X
 
Answer
Comment
Share
Q)

In how many ways can a group of 4boys be selected from 10 if.(a),the eldest

In how many ways can a group of 4boys be selected from 10 if.(a),the eldest boy is included in each group,(b),the eldest boy is excluded,(c),what proportional of all possible groups contain the eldestboy.

1 Answer

Comment
A)
a)choose 3 from 9 as eldezt boy is fixed

so

9C3=9!/(3!*6!)=84

b)eldest boy is excluded so choosing 4 from 9

9C4=9!/(5!*4!)=126

c)numbr of possible group

10c4=10!/(6!*4!)=210

so proportion of all possibl groups containing eldest boyis

84/210=2/5=40%
Help Clay6 to be free
Clay6 needs your help to survive. We have roughly 7 lakh students visiting us monthly. We want to keep our services free and improve with prompt help and advanced solutions by adding more teachers and infrastructure.

A small donation from you will help us reach that goal faster. Talk to your parents, teachers and school and spread the word about clay6. You can pay online or send a cheque.

Thanks for your support.
Continue
Please choose your payment mode to continue
Home Ask Homework Questions
Your payment for is successful.
Continue
...