The number of symbols that are preceded by a number in the given expression is ______.
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Counting Symbols Preceded by Numbers in an Expression
The question asks us to find the number of symbols in the given expression that are immediately preceded by a number. Preceded means coming right before.
The expression provided is:
R + J M 2 $ # Q R ? * O @ 7 F 3
To solve this, we need to carefully look at each number in the expression and check the character that comes immediately after it. We are only interested in the cases where the character immediately following a number is a symbol.
Step-by-Step Analysis of the Expression
Let's go through the expression and identify the numbers and the characters that follow them:
- The first number we encounter is 2. The character immediately following 2 is $. The character $ is a symbol. So, this is one instance where a symbol is preceded by a number.
- Continue scanning the expression. The next number is 7. The character immediately following 7 is F. The character F is a letter, not a symbol. This instance does not count.
- The last character is 3. There is nothing immediately following 3. This instance does not count.
Identifying Numbers Followed by Symbols
Let's list the numbers found and the characters that follow them:
| Number | Character Immediately Following | Is the Character a Symbol? | Does this instance count? |
|---|---|---|---|
| 2 | $ | Yes | Yes |
| 7 | F | No (It's a letter) | No |
| 3 | (End of expression) | N/A | No |
Based on our analysis, only one instance fits the criteria: the symbol $ which is preceded by the number 2.
Final Count of Symbols Preceded by a Number
By examining the expression and applying the condition, we found exactly one symbol ($) that is immediately preceded by a number (2).
Therefore, the number of symbols that are preceded by a number in the given expression is 1.
Revision Table: Counting Preceded Symbols
| Concept | Explanation | Relevance to Question |
|---|---|---|
| Symbol | A mark or character used as a conventional representation of an object, function, or process, e.g., $, #, ?, *, @. | We need to identify symbols in the expression. |
| Number | A numeral or figure representing a quantity, e.g., 0, 1, 2, ..., 9. | We need to identify numbers in the expression. |
| Preceded by | To come immediately before. | We need to check if a symbol comes immediately after a number. |
| Expression | A collection of characters (letters, numbers, symbols) arranged in a sequence. | The sequence we need to analyze. |
Additional Information: Pattern Analysis
Questions like this test your ability to carefully scan a sequence and identify specific patterns based on given conditions. The key is to break down the condition (symbol preceded by a number) and systematically check every part of the expression.
- Always read the condition carefully: "preceded by" means the character comes *before* the target character. In this case, the number comes before the symbol.
- Scan sequentially: Go through the expression from left to right.
- Identify the first element of the pattern: Find a number.
- Check the element immediately following it: See if it is a symbol.
- Repeat for all occurrences of the first element (numbers).
- Count the successful matches.
This systematic approach helps avoid missing any occurrences or incorrectly counting characters that don't fit the criteria (like letters or other numbers).
Similar Questions
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Counting to be done from left to right only.
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How many such letters are there, each of which is immediately preceded by a symbol and also immediately followed by another symbol?Refer to the following number, symbol series and answer the question. Counting to be done from left to right only. All numbers are single-digit numbers.
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How many such numbers are there each of which is immediately preceded by a symbol and also immediately followed by a symbol?
- Refer to the following number and symbol series and answer the question that follows.
(All numbers are single-digit numbers only.)
(Left) 3 ^ 5 # 6 £ 1 $ @ 8 % 7 * 4 ≺ Ω 9 2 (Right)
If all the symbols are dropped from the series, which of the following will be fifth from the left? The number of symbols that are preceded by a letter and not followed by a number in the following expression is ______.
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Y-25, W-23, U-21, S-19, ?A$1%MB#6&NC=3!OD+KP
Starting from 1 till O (inclusive of both), if every alternate letter or number or symbol is dropped then the fifth term from right is:How many such letters are there in the below arrangement, each of which is immediately preceded by a number and NOT immediately followed by a letter?
Q @ A 3 R I 4 * 6 T 4 & 4 O 2 ^ $ W S
Important Questions from Mixed Series
Identify the correct option to complete the following series.
5, 8, 13, 20, 29, ........., 53, 68, 85Select the alphanumeric-cluster from among the given options that can replace the question mark(?) in the following series.
2D, 3I, 4P, ?
From the given options, select the term that can replace the question mark (?) in the following series.
A1, B27, C125, ?Select the alphanumeric clusters from among the given options that can replace the question mark (?) in the following series.
z1, x4, v9, t16, ?
If all the special characters are dropped from the below arrangement, which of the following will be the 10th to the right of X?
3 X ! I B O # F 4 5 * 1 K 2 $ 8 R 8 % Z
