IBPS Clerk Prelims 2012 Paper

(c) (1) The word STABLE has six distinct letters.
∴Number of arrangements = 6 !
=6×5×4×3×2×1=720
(2) The word STILL has five letters in which letter ‘L’comes twice.
∴ Number of arrangements
=

5!

2

=60
(3) The word WATER has five distinct letters.
∴ Number of arrangements=5!=5×4×3×2×1=120
(4) The word ‘NOD’ has 3 distinct letters.
∴ Number of arrangements = 3 ! = 6
(5) Number of arrangements = 4 ! = 24