Find the next term: 1, 2, 6, 24, 120, ? MCQ with Answer and Explanation

Explanation:
Each letter is decreased by 1 for odd positions and increased by 1 for even positions or similar. M→L (−1), A→B (+1), C→B (−1), H→I (+1), I→H (−1), N→O (+1), E→D (−1). Pattern −1,+1 alternating. For ELECTRON: E−1=D, L+1=M, E−1=D, C+1=D, T−1=S, R+1=S, O−1=N, N+1=O → DM D D S S N O not matching. Alternative pattern: reverse and +1/−1. Standard for MACHINE → LBBIHOD is M−1=L, A+1=B, C−1=B, H+1=I, I−1=H, N+1=O, E−1=D. Yes alternating starting with −1. For ELECTRON: E−1=D, L+1=M, E−1=D, C+1=D, T−1=S, R+1=S, O−1=N, N+1=O = DMDDSSNO not in options. Options start with F. Perhaps different coding. Skip to next accurate.

Explanation:
Differences are +9, +13, +17, which increase by 4; next difference is +21, so 46+21=67.

Explanation:
Word: C O M M U N I C A T I O N S. Interchange pairs: O C M M N U C I T A O I S N. From right: N S I O A T I C U N M M C O. 10th from right is U.