solution with a proper explanation
I don't want an DK Goel solution....
I want an solution with steps & easy explanation.....

Dear student this question is posted twice bite you and earlier the answer to seem has been provided which is available on the Meritnation site. The answer provided earlier was pretty much easy and understandable. Kindly let us know no that in which point or at which step you have query, which is not clear to you so that we can help you accordingly. Sorry for the inconvenience. Kindly repost the query with your doubt. Regards