Question 81

The two sequences 1,4,16,64,......and 5,20,80,320,....... are used to form a new sequence as follows:
1,5,4,20,16,80,64,320,.....
Then the number immediately preceding the number 1048576 is the new sequence is

Solution

In the series, there are numbers ending with a 0 and ones not ending with a 0. For numbers not ending with a 0, the number before is 5/4 of the number. So, The number to come before 1048576 in the series is 1048576 x 5/4 = 1310720

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2013 RRB Allahabad

The two sequences 1,4,16,64,......and 5,20,80,320,....... are used to form a new sequence as follows: 1,5,4,20,16,80,64,320,..... Then the number immediately preceding the number 1048576 is the new sequence is

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The two sequences 1,4,16,64,......and 5,20,80,320,....... are used to form a new sequence as follows:
1,5,4,20,16,80,64,320,.....
Then the number immediately preceding the number 1048576 is the new sequence is