| Question | Select the number from among the given options that can replace the question mark (?) in the following series. 74, 74, 72, 24, ?, 4 | |
| Type | multiple_choice | |
| Option | 15 | incorrect |
| Option | 21 | incorrect |
| Option | 20 | correct |
| Option | 9 | incorrect |
| Solution | Pattern: + 1, – 2, +3, – 4, + 5 | |
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