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The sum of the first 20 terms of the series 1 + 1 + 1 + ..... is 5 × 6 6 × 7 7 × 8
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- 0.16
- 1.6
- 16
- 0.016
- 0.16
Correct Option: A
From the question ,
| First term = | = | - | |||
| 5 × 6 | 5 | 6 |
| Second term = | = | - | |||
| 6 × 7 | 6 | 7 |
| 20th term = | = | - | |||
| 24 × 25 | 24 | 25 |
| ∴ Required sum = | - | + | - | + ...... + | - | ||||||
| 5 | 6 | 6 | 7 | 24 | 25 |
| Required sum = | - | = | = | ||||
| 5 | 25 | 25 | 25 |
Required sum = 0.16
