Series: 5, 11, 23, 47, 95, ?, 383. What is the missing number?
Answer: B
Pattern: each number is double minus 1 plus increment. Actually, 5×2+1=11, 11×2+1=23, 23×2+1=47, 47×2+1=95, 95×2+1=191, 191×2+1=383.
Q.82Medium
Find the odd one out: SPARROW, CROW, PENGUIN, PARROT, EAGLE
Answer: A
Sparrow, Crow, Parrot, and Eagle are all flying birds. Penguin cannot fly and lives primarily in water/ice.
Q.83Medium
All politicians are ambitious. No ambitious person is humble. Conclusion: No politician is humble. This conclusion is:
Answer: A
Politicians are ambitious (given). No ambitious person is humble (given). Therefore, no politician is humble. This follows logically from both premises.
Q.84Medium
If FRANCE is coded as 6-18-1-14-3-5, then SPAIN is coded as:
Some cats are dogs. All dogs are animals. Conclusion: Some cats are animals. This conclusion is:
Answer: A
Some cats are dogs. All dogs are animals. Therefore, those cats that are dogs must also be animals. The conclusion logically follows.
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Q.86Medium
Find the odd one out: ROSE, LILY, SUNFLOWER, CACTUS, DAISY
Answer: A
Rose, Lily, Sunflower, and Daisy are all flowering plants that grow in normal soil. Cactus is a succulent plant that grows in arid/desert conditions.
Q.87Medium
In a row of 20 students, Raj is 9th from the left. Priya is 5 positions to the right of Raj. What is Priya's position from the right?
Answer: C
Raj is 9th from left. Priya is 5 positions right of Raj, so Priya is 9+5=14th from left. From right: 20-14+1=7th from right.
Q.88Medium
All trees are plants. No animal is a plant. Which of the following is true?
Answer: B
Since all trees are plants and no animal is a plant, logically no animal can be a tree.
Q.89Medium
Some singers are dancers. Some dancers are actors. Which conclusion is definitely correct?
Answer: C
From two 'some' statements, we cannot draw a definite conclusion about the relationship between singers and actors.
Q.90Medium
All gold is precious. Some precious things are expensive. Can we say 'Some gold is expensive'?
Answer: B
Although all gold is precious, only some precious things are expensive, so we cannot definitively conclude gold is expensive.
Q.91Medium
No criminal is honest. Some dishonest people are criminals. What follows?
Answer: C
Since no criminal is honest, it means all criminals must be dishonest (contrapositive of the first statement).
Q.92Medium
All leaders are decision makers. Some decision makers are not politicians. Which conclusion is valid?
Answer: A
Since some decision makers are not politicians, and all leaders are decision makers, some leaders must not be politicians.
Q.93Medium
No student is lazy. All lazy people are unsuccessful. What can be concluded?
Answer: D
While no student is lazy, and lazy people are unsuccessful, this doesn't tell us about unsuccessful students who might be lazy or for other reasons.
Q.94Medium
All X are Y. No Y is Z. Some Z are W. What is the relationship between X and Z?
Answer: B
Since all X are Y and no Y is Z, by logical deduction, no X can be Z.
Q.95Medium
All software engineers are problem solvers. Some problem solvers are not creative. Based on this, which conclusion is possibly true but not definitely true?
Answer: A
While some problem solvers are not creative, some software engineers might still be creative - this is possible but not definite.
Q.96Medium
All doctors are educated. Some educated people are rich. No rich person is unhappy. What can be concluded?
Answer: C
We know some educated people are rich and no rich person is unhappy. Since some doctors are educated (subset), some doctors could be among those rich people, making them not unhappy.
Q.97Medium
All flowers are plants. All plants require sunlight. Some things requiring sunlight are expensive. Which is possibly true?
Answer: B
All flowers are plants, all plants require sunlight. Since some things requiring sunlight are expensive, it's possible that some flowers (being things requiring sunlight) are expensive.
Q.98Medium
All innovations are risky. Some risky ventures fail. Can we conclude that some innovations fail?
Answer: B
All innovations are risky, but we only know some risky ventures fail. We cannot establish that the innovations which are risky are necessarily among those risky ventures that fail.
Q.99Medium
All programmers are logical thinkers. No illogical person is successful. Which conclusion is valid?
Answer: C
All programmers are logical thinkers. Since no illogical person is successful, programmers (being logical) are not excluded from being successful. They may be successful.
Q.100Medium
No mythical creature is real. All dragons are mythical creatures. Phoenix is a mythical creature. What about Phoenix?
Answer: B
Phoenix is a mythical creature, and no mythical creature is real. Therefore, Phoenix is not real.
