Please wait...
Contact Us
Contact
Need assistance? Contact us on below numbers

For Enquiry

10:00 AM to 7:00 PM IST all days.

Business Inquiry (North)

Business Inquiry (West / East / South)

OR

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this number

022-62211530

Mon to Sat - 10 AM to 7 PM

ques no37

Asked by chandanbr6004 30th November 2017, 9:36 PM
Answered by Expert
Answer:
begin mathsize 16px style 1 minus 2 straight x plus 3 straight x squared minus 4 straight x cubed plus....... is space AGP
so space common space ratio space is space minus straight x
straight S plus xS equals 1 minus open parentheses straight x minus straight x squared plus straight x cubed plus... close parentheses
straight S open parentheses 1 plus straight x close parentheses equals 1 minus fraction numerator straight x over denominator 1 plus straight x end fraction
straight S equals fraction numerator 1 over denominator open parentheses 1 plus straight x close parentheses end fraction minus straight x over open parentheses 1 plus straight x close parentheses squared
equals open parentheses 1 plus straight x close parentheses to the power of negative 4 end exponent
now space coeff space of space straight x to the power of straight r space in space open parentheses 1 plus straight x close parentheses to the power of negative straight n end exponent space is space
equals open parentheses negative 1 close parentheses to the power of straight r space end exponent cross times straight C presuperscript space space straight n plus straight r minus 1 end presuperscript subscript straight r
now space coeff space of space straight x to the power of straight n space in space open parentheses 1 plus straight x close parentheses to the power of negative 4 end exponent space is space
equals open parentheses negative 1 close parentheses to the power of straight n space end exponent fraction numerator open parentheses straight n plus 3 close parentheses open parentheses straight n plus 2 close parentheses open parentheses straight n plus 1 close parentheses over denominator 3 factorial end fraction end style
Answered by Expert 1st December 2017, 6:16 PM
Rate this answer
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Your answer has been posted successfully!
JEE QUESTION ANSWERS

Chat with us on WhatsApp