Numbers-Data Intensity 4 Multiple Questions and Answers.
Exercise Questions ::
Numbers
| Answer: Option D |
|
|
| Explanation: |
|
20 x x = (64 + 36)(64 - 36) = 100 x 28
|
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
| Answer: Option C |
|
|
| Explanation: |
|
The square of a natural number never ends in 7.
42437 is not the square of a natural number. |
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
| Answer: Option C |
|
|
| Explanation: |
|
(22 + 42 + 62 + ... + 202) = (1 x 2)2 + (2 x 2)2 + (2 x 3)2 + ... + (2 x 10)2
= (22 x 12) + (22 x 22) + (22 x 32) + ... + (22 x 102)
= 22 x [12 + 22 + 32 + ... + 102]
 |
Ref: (12 + 22 + 32 + ... + n2) = |
1 |
n(n + 1)(2n + 1) |
 |
|
6 |
= |
 |
4 x |
1 |
x 10 x 11 x 21 |
 |
6 |
= (4 x 5 x 77)
= 1540. |
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
| Answer: Option B |
|
|
| Explanation: |
|
Given Exp. = |
(a3 - b3) |
= (a - b) = (854 - 276) = 578 |
(a2 + ab + b2) |
|
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
| Answer: Option C |
|
|
| Explanation: |
|
Given Exp. = 35 + 15 x |
3 |
= 35 + |
45 |
= 35 + 22.5 = 57.5 |
2 |
2 |
|
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
«»