Aptitude Question:

Complete the series. 4, -5, 11, -14, 22, ____?

Answer is -27:

4 - (-5) = 9
-5-11= - 16
11- (-14) = 25
-14-22= - 36
22- (x)= 49
-> x= -27

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How many 9 digit numbers are possible by using the digits 1,2,3,4,5 which are divisible by 4 if the repetition is allowed?	If there are 30 cans out of them one is poisoned if a man tastes very little he will die within 14 hours. Now mice are used to test in 24 hours, how many mices are required to find the poisoned can?