Concept:Use the positional clues to reduce the possible arrangements and find the only meaningful word.
Explanation:Let the seven positions be numbered 1 to 7 from the left.
Since either B or R is at the left end and exactly two letters are placed between them:
Case 1:
BÂ _Â _Â RÂ _Â _Â _Case 2:
RÂ _Â _Â BÂ _Â _Â _I is immediately right of R:
Case 1:
BÂ _Â _Â RÂ IÂ _Â _Case 2:
RÂ IÂ _Â BÂ _Â _Â _Let E be at position
p and N at position
q.
Letters to the left of E equal letters to the right of N, so
p−1=7−q, giving
p+q=8.
G is immediately right of N, so N and G must be adjacent with N before G.
E is immediately left of A, so E and A must be adjacent with E before A.
In Case 2, the remaining positions do not allow both adjacent pairs to fit.
So Case 2 is eliminated.
In Case 1, the valid arrangements are:
BÂ EÂ AÂ RÂ IÂ NÂ G = BEARING
BÂ NÂ GÂ RÂ IÂ EÂ A = not a meaningful word
Only the word BEARING is meaningful.
The fourth letter from the left end of BEARING is R.
Answer:R