exam Maths Puzzle


There are 2 brothers among a group of 20 persons. In how many ways can the group be arranged around a circle so that there is exactly one person between the two brothers?

A.

2 × 17!

B.

18! × 18

C.

19! × 18

D.

2 × 18!

E.

2 × 17! × 17!

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exam Other Question

In how many ways can seven friends be seated in a row having 35 seats, such that no two friends occupy adjacent seats?

A.

29P7

B.

29C7

C.

28P7

D.

29C7 a,b,c,d and e are five natural numbers. Find the number of ordered sets (a,b,c,d,e) possible such that a+b+c+d+e=64.

A.

64C5

B.

63C4

C.

65C4

D.

63C5