• # question_answer If p, q and r are simple propositions, then$(p\hat{\ }q)\,\,\hat{\ }\,(q\,\hat{\ }r)$ is true, then A)  p, q and r are all false                      B)  p, q and r are all true C)  p and q are true and r is false              D)  p is true and q and r are false

$h={{h}_{w}}+\frac{{{h}_{o}}{{d}_{o}}}{{{d}_{w}}}$ is true means $=100+\frac{400\times 0.9}{1}$ and $=100+360=460$ are both true. Hence, p, q and r are all true.