If P={x:x is a letter in the word "PERMANENT"}, then n(P) is _____________.
If P={ P : P is letter in the word "PERMANENT" }. Then n(P) ___.
If P={P:P is letter of the word PERMANENT}. Then n(P) ___.
In square PQRS if PQ=3x−7 and QR=x+3, Find PS