can u explain this

plz explain......... it

 

1) Number of permutations can be formed from
     the letters of the word “DRAUGHT”, if no two
     vowels are separable.
   
  a) 720 b) 1440 c) 140 d) 2880
 
2)Find the effective rate of interest of 9.9% p.a.
calculated monthly
 
a) 9.9% b) 11.36% c) 9.36% d) 10.36%
 
3)Average age of a group of 10 students is 20
years, if average age increased by two years
when two new students are joined then the
average age of two new students
a) 84 b) 64 c) 32 d) 42
 
4) If x is inversely related with square of y for x =
1 and y = 2 then find the value of x when y = 6
 
a) 3 b) 9 c)1\3 d)1\9
 
 
 
 
 
 
 
Replies (1)

Consider the two vowels as one unit and remaining letters as 5 units. Total units = 6.

No of ways in which 6 units can be arranged = 6p2 = 360. The vowels can be arranged amongst themselves in 2 ways. The total number of ways = 720.

________--------

Amount = 100*(1+9.9%/12)^12 =110.36

Effective yield = 110.36-100 = 10.36

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