In the sequence 1, 5, 7, 3, 5, 7, 4, 3, 5, 7, how many such 5s are there which are not immediately preceded by

Question

In the sequence 1, 5, 7, 3, 5, 7, 4, 3, 5, 7, how many such 5s are there which are not immediately preceded by 3 but are immediately followed by 7?

Accepted Answer

The question asks to find the number of 5s in the sequence that are NOT immediately preceded by 3 but ARE immediately followed by 7.

Let's examine each '5' in the sequence: 1, 5, 7, 3, 5, 7, 4, 3, 5, 7

1.  The first '5':
    -   It is preceded by '1' (not 3).
    -   It is followed by '7'.
    -   This '5' meets both conditions. (Count = 1)

2.  The second '5':
    -   It is preceded by '3'.
    -   This '5' does not meet the condition of "not immediately preceded by 3". So, it is not counted.

3.  The third '5':
    -   It is preceded by '3'.
    -   This '5' does not meet the condition of "not immediately preceded by 3". So, it is not counted.

Only one '5' in the sequence satisfies both given conditions.

Therefore, the correct answer is 1.

Answer

1

Answer

2

Answer

3

Answer

none

In the sequence 1, 5, 7, 3, 5, 7, 4, 3, 5, 7, how many such 5s are there which are not immediately preceded by 3 but are immediately followed by 7?

Explanation

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