Number And Alphabet Sequence - Number Set
Number And Alphabet Sequence - Number Set
Number/alphabet sequence is a combination of numeric and/or alphabetic characters. Before starting with the questions, let us understand the meaning of 'following', 'followed by', 'preceding' and preceded by'.
In this type of questions, generally a set, group or series of numerals is given and the candidate is asked to trace out numerals following certain given conditions of lying at specific mentioned positions after shuffling according to a certain given pattern.
Example 1 : How many such 5s are there in the following number sequence each of which is immediately preceded by 3 or 4 but not immediately followed by 8 or 9 ?
3 5 9 5 4 5 5 3 5 8 4 5 6 7 3 5 7 5 5 4 5 2 3 5 1 0
(a) None (b) Three (c) Four (d) Five (e) None of these
Solution : As you know, a number which comes after a given number is said to follow it while the one which comes before the given number precedes it. Thus, the numbers satisfying the given conditions may be marked as follows :
3 5 9 5 4 5 5 3 5 8 4 5 6 7 3 5 7 5 5 4 5 2 3 5 1 0
Clearly, there are five such 5s. Hence, the answer is (d).
Example 2: In the series, 6 4 1 2 2 8 7 4 2 1 5 3 8 6 2 1 7 1 4 1 3 2 8 6. How many pairs of successive numbers have a difference of 2 each ?
(a) Four (b) Five (c) Six (d) Seven
Solution : Clearly, the pairs of successive numbers having a difference of 2 can be shown as follows :
Thus, there are six such pairs. Hence, the answer is (c).
How many 7's immediately are preceded by 6 but not immediately followed by 4 are there in the following series? 7 4 2 7 6 4 3 6 7 5 3 5 7 8 4 3 7 6 7 2 4 0 6 7 4 3 | |||
| Right Option : B | |||
| View Explanation | |||
In the series given below, count the number of 9's, each of which is not immediately preceded by 5 but is immediately followed by either 2 or 3. 1 9 2 6 5 9 3 8 3 9 3 2 5 9 2 9 3 4 8 2 6 9 8 | |||
| Right Option : B | |||
| View Explanation | |||
Study the following number sequence given below and answer the question. 8, 9, 7, 6, 3, 4, 2, 8, 9, 7, 6, 4, 5, 9, 2, 9, 7. How many 9's are there which are preceded by even numbers ? | |||
| Right Option : D | |||
| View Explanation | |||
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