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NDA Exam Mathematics Study Material

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Permutation and Combination

2! + 3! =

a) 8
b) 10
c) 16
d) 12

✔Answer

Correct Answer Is : 8

Solution Is :

In how many ways 6 letters can be posted in 5 letter boxes?

a) 5 ^ 6
b) 6 ^ 5
c) 4 ^ 4
d) None of this

✔Answer

Correct Answer Is : 5 ^ 6

Solution Is :

5/i^25

a) 5i
b) (-5i)
c) 1
d) 0

✔Answer

Correct Answer Is : 5i

Solution Is :

A journey from place A to place B can be done by three different modes, i.e. bike, train, bus or aero plane. If a person wants to go from A to B and return, in how many ways this can be done?

a) 12
b) 8
c) 9
d) 16

✔Answer

Correct Answer Is : 12

Solution Is :

In how many ways 6 students can be arranged in a order

a) 720
b) 120
c) 210
d) 250

✔Answer

Correct Answer Is : 720

Solution Is :

What is the number of ways of choosing 8 students from 80 students?

a) 80C8
b) 80P8
c) 8C80
d) None of this

✔Answer

Correct Answer Is : 80C8

Solution Is :

Find the number of words with or without meaning which can be made using all the letters of the word FALL.

a) 12
b) 24
c) 60
d) 72

✔Answer

Correct Answer Is : 12

Solution Is :

C(30,r) = C(30, r + 2) then What is the value of C(r,6) ?

a) 3003
b) 2002
c) 2003
d) 3002

✔Answer

Correct Answer Is : 3003

Solution Is :

If n=5 and r=2 then n! / (n-r)! Is equal to

a) 20
b) 10
c) 16
d) 25

✔Answer

Correct Answer Is : 20

Solution Is :

Value of nP^o

a) 1
b) N
c) 0
d) None of this

✔Answer

NDA Exam Mathematics Study Material

Permutation and Combination

2! + 3! =

Correct Answer Is : 8

Solution Is :

In how many ways 6 letters can be posted in 5 letter boxes?

Correct Answer Is : 5 ^ 6

Solution Is :

5/i^25

Correct Answer Is : 5i

Solution Is :

A journey from place A to place B can be done by three different modes, i.e. bike, train, bus or aero plane. If a person wants to go from A to B and return, in how many ways this can be done?

Correct Answer Is : 12

Solution Is :

In how many ways 6 students can be arranged in a order

Correct Answer Is : 720

Solution Is :

What is the number of ways of choosing 8 students from 80 students?

Correct Answer Is : 80C8

Solution Is :

Find the number of words with or without meaning which can be made using all the letters of the word FALL.

Correct Answer Is : 12

Solution Is :

C(30,r) = C(30, r + 2) then What is the value of C(r,6) ?

Correct Answer Is : 3003

Solution Is :

If n=5 and r=2 then n! / (n-r)! Is equal to

Correct Answer Is : 20

Solution Is :

Value of nP^o

Correct Answer Is : 1

Solution Is :

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