Question

How many four letter words can be formed by using the letters of the word ${}^{\prime }LOGARITHM{S}^{\prime }$ such that words should always start with $R$?

• A. ${}^9{C}_3$
• B. ${}^9{P}_3$
• C. ${}^{10}{P}_4$
• D. ${10}^4$

Answer 1

Answer: (B)

${}^9{P}_3$

LOGARITHMS $10$ letters

Four lettered word starting with $R$

Out of rest nine letters we need to select three

Number of ways of selecting

${\Rightarrow }^9{P}_3$