21. Write a method to generate Pascal's Triangle up to n rows.
Required Input:
n = 5Expected Output:
[[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]
Code In Ruby
# Predefined number of rows
n = 5
# Your logic here
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22. Create a program to find the GCD (Greatest Common Divisor) of two numbers using recursion.
Required Input:
Number 1: 48, Number 2: 18Expected Output:
6
Code In Ruby
# Predefined numbers
num1 = 48
num2 = 18
# Your logic here
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23. Write a program to count the number of occurrences of a substring in a string.
Required Input:
String: "abababab", Substring: "ab"Expected Output:
4
Code In Ruby
# Predefined string and substring
string = "abababab"
substring = "ab"
# Your logic here
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24. Create a method to find the longest common prefix among an array of strings.
Required Input:
["flower", "flow", "flight"]Expected Output:
fl
Code In Ruby
# Predefined array of strings
strings = ["flower", "flow", "flight"]
# Your logic here
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25. Write a program to check if a number is a happy number.
Required Input:
19Expected Output:
true
Code In Ruby
# Predefined number
number = 19
# Your logic here
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26. Create a method to find the maximum profit from stock prices where you can only buy and sell once.
Required Input:
[7, 1, 5, 3, 6, 4]Expected Output:
5
Code In Ruby
# Predefined stock prices
prices = [7, 1, 5, 3, 6, 4]
# Your logic here
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27. Write a method to perform a binary search on a rotated sorted array.
Required Input:
Array: [4, 5, 6, 7, 0, 1, 2], Target: 6Expected Output:
2
Code In Ruby
# Predefined rotated array and target
array = [4, 5, 6, 7, 0, 1, 2]
target = 6
# Your logic here
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28. Create a class Student with methods to calculate the average and grade based on marks.
Required Input:
Marks: [85, 90, 78, 92, 88]Expected Output:
Average: 86.6
Grade: B
Code In Ruby
# Predefined marks
marks = [85, 90, 78, 92, 88]
# Your logic here
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29. Implement a program to validate a credit card number using the Luhn algorithm.
Required Input:
4532015112830366Expected Output:
true
Code In Ruby
# Predefined credit card number
card_number = 4532015112830366
# Your logic here
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30. Write a program to check if two strings are rotations of each other.
Required Input:
String1: "hello", String2: "lohel"Expected Output:
true
Code In Ruby
# Predefined strings
string1 = "hello"
string2 = "lohel"
# Your logic here
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