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11.
1399 x 1399 = ?
- A.1687401
- C.1943211
- B.1901541
- D.1957201
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| (1399 x 1399) = (1399)2 = (1400 - 1)2 = (1400)2 + 12 - 2 x 1400 x 1 | ||||
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12.
Which of the following numbers is exactly divisible by 24?
- A.35718
- C.537804
- B.63810
- D.3125736
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The required number should be divisible by 3 and 8 |
| (a) 718 is not divisible by 8 |
| (b) 810 is not divisible by 8 |
| (c) 804 is not divisible by 8 |
| (d) Sum of digits = 27, which is divisible by 3. |
| And, 736 is divisible by 8. So given number is divisible by 3 and 8. |
13.
If x is a whole number, then x2 ( x2 - 1) is always divisible by :
- A.12
- C.12-x
- B.24
- D.multiple of 12.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Putting x = 2, we get 22 (22 - 1) = 12. So, x2(x2 - 1) is always divisible by 12. |
14.
325325 is a six-digit number. It is divisible by :
- A.7 only
- C.13 only
- B.11 only
- D.all 7, 11 and 13
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Clearly, 325325 is divisible by all 7, 11 and 13. |
15.
If 6x43 – 46y9 = 1904, which of the following should come in place of x=?
- A.4
- C.9
- E.None of these
- B.6
- D.Cannot be determined
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
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