Ques no.7 please!
Kindly, refer to the below link for similar query,
https://www.meritnation.com/ask-answer/question/if-s-is-the-sum-p-the-product-and-r-the-sum-of-reciproca/math/9710265
Regards.
https://www.meritnation.com/ask-answer/question/if-s-is-the-sum-p-the-product-and-r-the-sum-of-reciproca/math/9710265
Regards.