# In ΔABC , if a=13, b=12 cm, c=5cm, then sin A/2 =

1.  1/√5

2.  1/√2

3.

4.  2/3

4

Explanation :
No Explanation available for this question

# Ten different letters of alphabet are given. Words with 5letters are formed from these given letters, then the number of words which have atleast one letter repeated is

1.  69760

2.    30240

3.  99748

4.  none

4

69760

Explanation :
No Explanation available for this question

# The number of four letter words using the letters of the word MISTER in which atleast one letter is repeated is

1.  1296

2.  936

3.  360

4.   none

4

936

Explanation :
No Explanation available for this question

# The number of four digit telephone numbers having at least one of their digits repeated is

1.   5040

2.  4464

3.  2520

4.   2480

4

4464

Explanation :
No Explanation available for this question

# The number of numbers between 1 and 1010 which contain the digit 1 is

1.  1010-910-1

2.   910

3.  1010-810

4.   none of these

4

1010-910-1

Explanation :
No Explanation available for this question

# The number of three digit numbers of the form xyz with x < y, z > y and x ≠ 0 is

1.   900

2.  648

3.  720

4.  240

4

240

Explanation :
No Explanation available for this question

# A telegraph post has 5arms. Each arm is capable of four distinct positions including the position of rest.The total number of signals that can be made is

1.  1024

2.  1042

3.  30240

4.   none

4

30240

Explanation :
No Explanation available for this question

# If R=[5+√21]2n+1 and f=R-[R], where [R]denotes the greatest integer less than or equal to R, then RF=

1.  42n+1

2.  42n-1

3.  202n+1

4.  202n-1

4

42n+1

Explanation :
No Explanation available for this question

# If (6√6+14)2n+=R and F=R-[R], where [R] denotes the greatest integer less than or equal to R, then RF=

1.  42n+1

2.  42n-1

3.  202n+1

4.  202n-1

4

202n+1

Explanation :
No Explanation available for this question

1.  1

2.  22n

3.  22n-1

4.  2nCn

4