Q.

The letters of the word triangle are arranged at random. The probability that the word so formed starts with T and ends with R is

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a

28!

b

68!

c

128

d

156

answer is D.

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Detailed Solution

T R I A N G L E⇒n(S)=8!       n(A)=6!∴P(A)=156
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The letters of the word triangle are arranged at random. The probability that the word so formed starts with T and ends with R is