Hard Series

What is the next number in this series?

4,12,84,3612....




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Can you fill the blank with the correct number?

6 30 870 756030 _____

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If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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A shepherd had 18 sheep, out of which, all but ten died.

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Eight Chelsea player makes the following statements :

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In a classic wine shop, the list of three most popular wines are:
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John entered the wine shop and he needs to buy
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A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

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John bought a new car. He has a habit of eating ice cream from a particular ice cream shop while returning home from office. Whenever, he eats strawberry ice cream, he faces no problem. But whenever, he eats chocolate ice cream, the car starts giving problem. At first, he thinks, it is just a co-incidence but when this awkward incident happens for 3-4 times, he reports this problem to the company.

The mechanic of the company checks but finds no problem at all. The next day, when he stops by to eat chocolate ice cream, the car again starts giving problem.

Can you find the possible reason?

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I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
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How should I do it?

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When is the top of a mountain similar to a savings account?

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In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki