A binary number is represented by (cdccddcccddd)2, where c > d What is its decimal equivalent ?
1848
2048
2842
2872
D.
2872
We know that the binary number have only two digits (0 & 1)
As given in the question c > d i.e, c = 1 & d = 0
Then, the given number will be (cdccddcccddd)2 =
(101100111000)2
Binary No. | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
Decimals | 2048 | 1024 | 512 | 256 | 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
Now add up the higher bit only : 2048 + 512 + 256 + 32 + 16 + 8 = 2872
Hence option D is correct
Let S = {2, 4, 6, 8, ..........20}. What is the maximum number of subsets does S have ?
10
20
512
1024
Consider the following statements in respect of the quadratic equation 4(x - p)(x - q) - r2 = 0, where p, q and r are real numbers:
1) The roots are real
2) The roots are equal if p = q and r = 0
Where of the above statements is/are correct ?
1 only
2 only
Both 1 and 2
Neither 1 nor 2
How many real roots does the equation x2 + 3|x| + 2 = 0 have ?
1 only
2 Only
Both 1 and 2
Neither 1 nor 2
What is the solution of x ≤ 4, y ≥ 0 and x ≤ - 4, y ≤ 0 ?
x ≥ - 4, y ≤ 0
x ≤ 4, y ≥ 0
x ≤ - 4, y = 0
x ≥ - 4, y = 0
If 3rd, 8th and 13th terms of a GP are p, q and r respectively, then which one of the following is correct ?
q2 = pr
r2 = pq
pqr = 1
2q = p + r
Let Sn be the sum of the first n terms of an AP. If S2n = 3n + 14n2, then what is the common difference ?
5
6
7
9
Let a, b, c be in AP and k ≠ 0 be a real number. Which of the following are correct ?
1) ka, kb, kc are in AP
2) k –a, k -b, k –c are in AP
3) are in AP
Select the correct answer using the code given below :
1 and 2 only
2 and 3 only
1 and 3 only
1, 2 and 3