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In the following series of numbers, find...

In the following series of numbers, find out how many times 1, 3 and 7 have appeared together, 7 being in the middle and 1 and 3 on either side of 7?
2 9 3 1 7 3 7 7 7 1 3 3 1 7 3 8
5 7 1 3 7 7 1 7 3 9 0 6

A

3

B

4

C

5

D

more than 5

Text Solution

Verified by Experts

The correct Answer is:
A
The given number series is as follows:

`:.` Required pattern = `(1)/("Preceding")(7)/("Middle")3/("Following")`
Therefore, total number of such pattern = 3
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LUCENT PUBLICATION-NUMBER PROBLEMS -Exercise (Type-I: Counting of Digits in the Sequence)
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  4. How many such 6s are there in the following number series, each of whi...

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  5. How many 4's are there preceded by 7 but not followed by 3? 5 9 3 2 ...

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  6. How many 7'immediately preceded by 6 but not immediately followed by ...

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  7. In the following series, how many such odd numbers are there which are...

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  8. In the series given below count the number of 9s. each of which is not...

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  9. How many such 5s are there in the following number series each one of ...

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  10. In the following series of digits how many even number are immediately...

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  11. In the following series, how many such odd numbers are there which are...

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  12. In the following number sequence, how many such even numbers are there...

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  13. Count each 2 in the following sequence of numbers that is immediately ...

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  14. How many digits are there in the following sequence which are either i...

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  15. In the following number series, how many 6s are there which are immedi...

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  16. 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" h...

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  17. In the series, how many pairs of alternate numbers have a difference ...

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  18. In the following number series, how many even numbers are there, which...

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  19. How many 3s are there in the following sequence such that the sum of t...

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  20. In a school, the following codes were used during physical exercise pe...

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