Hello Sanidhya,
Yes, you are right, there is a typo in our Theorem 10.7, we'll correct it soon.
And for Ex 10.4, 1 of Class 9, the answer is a bit long because we wanted to explain it properly. Do you have any other solution which explains the answer in a better way? Please upload it and help improve teachoo :)
Written on March 21, 2017, 11:43 p.m.