Find the next number in the series: 3, 6, 18, 72, ? MCQ with Answer and Explanation

Explanation:
North 5, left West 3, right North 5. Facing North.

Explanation:
The sequence positions of 5 3 not followed by 9: 5 3 4, 5 3 8, 5 3 2. Three such.

Explanation:
Pattern: B+1=C, O+2=Q, O+2=Q, K+1=L? Not consistent. Let's use +1, +2, +2, +1. For NOTE: N+1=O, O+2=Q, T+2=V, E+1=F = OQVF. Options not match. We'll set correct OQVF. But option B OPUF no. Need fix options. Let's replace with consistent shift: If 'BOOK' coded as 'CPPL'? B+1=C, O+1=P, O+1=P, K+1=L. Then NOTE = OPUF. Use shift +1. So if BOOK=CPPL, NOTE=OPUF. Good.