Email
Chat with tutor
logo

Ask Questions, Get Answers

X
 
Answer
Comment
Share
Q)

In the set of integers with operation $^{\ast}$ defined by $a ^{\ast} b=a+b-ab,$ the value of $3^{\ast}(4^{\ast} 5)$ is

\[\begin{array}{1 1}(1)25&(2)15\\(3)10&(4)5\end{array}\]

1 Answer

Comment
A)
$a+b =a+b-ab$
$3 *(4*5) =3 * (4+5-4(5))$
$\qquad= 3 *(9-20)$
$\qquad= 3 * (-11)$
$\qquad =3 +(-11) -3(-11)$
$\qquad= 3-11+33$
$\qquad= -8+33=25$
Hence 1 is the correct answer.
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
Clay6 tutors use Telegram* chat app to help students with their questions and doubts.
Do you have the Telegram chat app installed?
Already installed Install now
*Telegram is a chat app like WhatsApp / Facebook Messenger / Skype.
...