If pqr = 0 , rst = 1 , and spr = 0, which of the following must be zero?
Choose the correct choice from the following answers
A) P	B) Q	C) R	D) S	E) T
rst = 1 which means neither r / s/ t is 0   r x pq = 0 , we know r is not 0 from above hence either p or q must be 0.   s x p x r = 0, we know from first expression that r an p are not 0 hence p =0.   option P
<result>A</result>
If pqr = 0 , rst = 1 , and spr = 0, which of the following must be zero?