[B].
[C].
[D].
Answer: Option B
Explanation:
Each of the numbers except 72 is a perfect square.
A. Rs.9630
B. Rs.9680
C. Rs.9610
D. Rs.9650
E. None of these
Explanation:
A= P{1 + R/100}n
=> 8000{1 + 10/100}22 = Rs.9680
[B].
[C].
[D].
Answer: Option C
Explanation:
| (A + B)’s 1 day’s work = | 1 | + | 1 | = | 1 | . | ||
| 15 | 10 | 6 |
| Work done by A and B in 2 days = | 1 | x 2 | = | 1 | . | ||
| 6 | 3 |
| Remaining work = | 1 – | 1 | = | 2 | . | ||
| 3 | 3 |
| Now, | 1 | work is done by A in 1 day. |
| 15 |
| 2 | work will be done by a in | 15 x | 2 | = 10 days. | |||
| 3 | 3 |
Hence, the total time taken = (10 + 2) = 12 days.
[B].
[C].
[D].
Answer: Option C
Explanation:
Greatest number of 4-digits is 9999.
L.C.M. of 15, 25, 40 and 75 is 600.
On dividing 9999 by 600, the remainder is 399.
Required number (9999 – 399) = 9600.
[B].
[C].
[D].
Answer: Option A
Explanation:
| Here a = 3 and r = | 6 | = 2. Let the number of terms be n. |
| 3 |
Then, tn = 384 arn-1 = 384
3 x 2n – 1 = 384
2n-1 = 128 = 27
n – 1 = 7
n = 8
Number of terms = 8.
[B].
[C].
[D].
Answer: Option D
Explanation:
| Angle traced by the hour hand in 6 hours = | 360 | x 6 | ° | = 180°. | ||
| 12 |