NDA & NA Exam (I)- 2022 - Mathematics Defence Question Paper

NDA Previous Year Question Papers Question Papers
NDA & NA Exam (I)- 2022 - Mathematics

NDA & NA Exam (I)- 2022 - Mathematics Defence Questions

11.
How many terms are there in the expansion of \( (1 + x)^{9}(1 - x)^{9} \)?
A.
9
B.
10
C.
19
D.
20
ANSWER :
B. 10
12.
Consider the following statements in respect of the expansion of \( (x + y)^{10} \):
1. Among all the coefficients of the terms, the coefficient of the 6th term has the highest value
2. The coefficient of the 3rd term is equal to coefficient of the 9th term
Which of the above statements is/are correct?
A.
1 only
B.
2 only
C.
Both 1 and 2
D.
Neither 1 nor 2
ANSWER :
C. Both 1 and 2
13.
If \( C(3n, 2n) = C(3n, 2n - 7) \), then what is the value of \( C(n, n - 5) \)?
A.
42
B.
35
C.
28
D.
21
ANSWER :
D. 21
14.
What is the value of
\( C(51, 21) - C(51, 22) + C(51, 23) - C(51, 24) + C(51, 25) - C(51, 26) + C(51, 27) - C(51, 28) + C(51, 29) - C(51, 30) \)?
A.
\( C(51, 25) \)
B.
\( C(51, 27) \)
C.
\( C(51, 51) - C(51, 0) \)
D.
\( C(51, 25) - C(51, 27) \)
ANSWER :
C. \( C(51, 51) - C(51, 0) \)
15.
How many odd numbers between 300 and 400 are there in which none of the digits is repeated?
A.
32
B.
36
C.
40
D.
45
ANSWER :
A. 32
16.
How many permutations are there of the letters of the word β€˜TIGER’ in which the vowels should not occupy the even positions?
A.
72
B.
36
C.
18
D.
12
ANSWER :
B. 36
17.
Let \( \alpha \) and \( \beta \) be the roots of the equation \( x^{2} + px + q = 0 \). If \( \alpha^{3} \) and \( \beta^{3} \) are the roots of the equation \( x^{2} + mx + n = 0 \), then what is the value of \( m + n \)?
A.
\( p^{3} + q^{3} + pq \)
B.
\( p^{3} + q^{3} - pq \)
C.
\( p^{3} + q^{3} + 3pq \)
D.
\( p^{3} + q^{3} - 3pq \)
ANSWER :
D. \( p^{3} + q^{3} - 3pq \)
18.
Let \( \alpha \) and \( \beta \) be the roots of the equation \( x^{2} - ax - bx + ab - c = 0 \). What is the quadratic equation whose roots are \( a \) and \( b \)?
A.
\( x^{2} - \alpha x - \beta x + \alpha\beta + c = 0 \)
B.
\( x^{2} - \alpha x - \beta x + \alpha\beta - c = 0 \)
C.
\( x^{2} + \alpha x + \beta x + \alpha\beta + c = 0 \)
D.
\( x^{2} + \alpha x + \beta x + \alpha\beta - c = 0 \)
ANSWER :
A. \( x^{2} - \alpha x - \beta x + \alpha\beta + c = 0 \)
19.
If the roots of the equation \( x^{2} - ax - bx - cx + bc + ca = 0 \) are equal, then which one of the following is correct?
A.
\( a + b + c = 0 \)
B.
\( a - b + c = 0 \)
C.
\( a + b - c = 0 \)
D.
\( -a + b + c = 0 \)
ANSWER :
C. \( a + b - c = 0 \)
20.
Let \( \alpha \) and \( \beta \) \( (\alpha > \beta) \) be the roots of the equation \( x^{2} - 8x + q = 0 \). If \( \alpha^{2} - \beta^{2} = 16 \), then what is the value of \( q \)?
A.
βˆ’15
B.
βˆ’10
C.
10
D.
15
ANSWER :
D. 15