book Interview Numerical Ability Permutation and Combination

how many ways of different necklace is formed from 5 green and 6 red beats?
a)18
b) 21
c)42
d)36

Read Solution (Total 3)

(11-1)!/(5!*6!)=42
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Explain it please alka
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ans=42
using circular permutation ,(5+6-1)!/((5!)(6!))=42 ways
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book Other Question

A has forgotten the phone no. of his friend B. all he remembers is that the number has 8 digits,ended with an odd number and has exactly one 9. how many possible numbers does he have to try to make sure he has got the right number? How many different sums can be formed with the following coins:
5 rupee, 1 rupee, 50 paisa, 25 paisa, 10 paisa & 1 paisa ?