Book Maths Puzzle Numerical Ability Permutation and Combination

How many different sums can be formed with the following coins:
5 rupee, 1 rupee, 50 paisa, 25 paisa, 10 paisa & 1 paisa ?

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Book Other Question

how many ways of different necklace is formed from 5 green and 6 red beats?
a)18
b) 21
c)42
d)36 A and B stand in a circle with 14 other persons.if the arrangement is random,what is the chance that there are exactly 4 persons between A and B.