Question:

The number of 5-letter words that can be formed from letters of CONSIDER using each letter at most once and beginning with C and ending with R is

$^7P_3$

$^7C_3\times 3!$

$^8P_3$

$^8C_3$

Step-by-Step Solution

Key Concept: C fixed at start, R fixed at end; choose and arrange 3 from remaining 7 letters

$^7P_3=210$.

Correct Answer: 1