# Aptitude Permutation and Combination

a) 150

b) 100

c) 120

d) None

Explanation:

a) 150

b) 175

c) 125

d) None

Explanation:

a) 648

b) 540

c) 432

d) 576

Explanation:

a) 118

b) 120

c) 108

d) None

Explanation:

a) 1000

b) 448

c) 512

d) None

Explanation:

a) 499

b) 500

c) 375

d) 376

Explanation:

##### 7)A number lock consists of 4 rings each marked with 10 different numbers. In how many cases the locks cannot be opened?

a) 4 to the power 10

b) 103

c) 10 to the power 4

Explanation:

##### 8) Find the number of 10 digit numbers formed 1, 2, 3, 4 and 8 which are divisible by 4, when repetition is allowed ?

a) 8 * 5 to the power 10

b) 5 to the power 10

c) 8 * 5 to the power 8

d) 7 * 5 to the power 8

Answer:c) 8 * 5 to the power 8

Explanation:

##### 9) In how many ways we can arrange 5 boys and 2 girls, such that girls always sit together?

a) 1500

b) 720

c) 1440

d) None of the above

Explanation:

##### 10) In how many different ways can the letters of the word 'SOFTWARE' be arranged in such a way that the vowels do not come together?

a) 8 !

b) 7 !

c) 8 ! - 3! X 6!

d) None of the above

Answer:c) 8 ! - 3! X 6!

Explanation: