In the sequence {1}, {2, 3}, {4, 5, 6}, {7, 8, 9, 10} .... of sets, the sum of elements in the 50th set is

1.  62525

2.  65225

3.  56255

4.  55625

View Answer  
4
Correct Answer :

62525


Explanation :
No Explanation available for this question

The least value of the natural number n satisfying C(n,5)+C(n,6)>C(n+1,5) is

1.  10

2.  12

3.  13

4.  11

View Answer  
4
Correct Answer :

11


Explanation :
No Explanation available for this question

The number of ways that 8 beads of different colours be strung as a necklace is

1.  2520

2.  2880

3.  4320

4.  5040

View Answer  
4
Correct Answer :

2520


Explanation :
No Explanation available for this question

The number of 5-digited numbers which are not divisible by 5 and which consists of different odd digits is

1.  96

2.  120

3.  24

4.  32

View Answer  
4
Correct Answer :

96


Explanation :
No Explanation available for this question

One die and a coin (both unbiased) are tossed simultaneously.The probability of getting 5 on the top of the die and tail on the coin is:

1.  1/8

2.  1/6

3.  1/12

4.  1/2

View Answer  
4
Correct Answer :

1/12


Explanation :
No Explanation available for this question

The sum of the coefficient in the expansion of (1+x+x2)n is

1.  2

2.  2n

3.  3n

4.  4n

View Answer  
4
Correct Answer :

3<sup>n</sup>


Explanation :
No Explanation available for this question

In the expansion of (1+x)n the coefficients of pth and (p+1)th terms are respectively P and q, then p+q is equal to

1.  n

2.  n+1

3.  n+2

4.  n+3

View Answer  
4
Correct Answer :

n+1


Explanation :
No Explanation available for this question

If the equations x2+ax+b=0 and x2+bx+a=0 (a≠b) have a common root, then a+b is equal to

1.  -1

2.  1

3.  3

4.  4

View Answer  
4
Correct Answer :

-1


Explanation :
No Explanation available for this question

(sinθ+sin2θ)/(1+cosθ+cos2θ) is equal to

1.  sinθ

2.  cosθ

3.  tanθ

4.  cotθ

View Answer  
4
Correct Answer :

tan&#952;


Explanation :
No Explanation available for this question

If 3 is a root of x2+kx-24=0. It is also a root of

1.  x2+5x+k=0

2.  x2+kx+24=0

3.  x2-kx+6=0

4.  x2-5x+k=0

View Answer  
4
Correct Answer :

x<sup>2</sup>-kx+6=0


Explanation :
No Explanation available for this question
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