Challenge No. 77: Create a formula to receive a number n as input and generate a rhombus with a diameter equal to n using “*” characters.
Solved using:Excel (DROP, IF, LAMBDA), Power Query (List.Transform), Python, R, and VBA.
LAMBDA
Creates custom reusable functions in Excel.
Reverse Stepped Tax!
Challenge No. 76: In challenge 58, we aimed to find an efficient way to calculate the stepped tax based on the tax rates presented in the question table.
Solved using:Excel (IFERROR, INDEX, LAMBDA), Power Query (Table.AddColumn), Python, Python in Excel, and R.
Avg Delivery Time
Challenge No. 75: In the Question table, the order date for different products is provided (determined by positive quantity).
Solved using:DAX, Excel (CHOOSECOLS, FILTER, HSTACK), Power Query (Table.AddColumn, Table.Group, Table.SelectRows), Python, R, and SQL.
Determining Missing Fields
Challenge No. 74: Customer information including Name, Family, Phone, and Website is provided in the question table.
Solved using:Excel (ARRAYTOTEXT, FILTER, HSTACK), Power Query (List.Difference, List.Distinct, Text.Combine), Python, and R.
Custom Splitter (Part 2)!
Challenge No. 73: In the Question table, sales information including Date, Product Names, and quantity are provided without any separators like CH 63 with the difference that on each date, more than one transaction might provided.
Solved using:Excel (CHAR, DROP, HSTACK), Power Query (List.Skip, List.Transform, Table.AddColumn), Python, and R.
Fibonacci Sequence!
Challenge No. 72: Generate the first 18 terms of Fibonacci sequence as result table.
Solved using:Excel, Power Query, Python, R, and VBA.
Coin Change Problem!
Challenge No. 70: Consider a set of coin denominations as: {1$, 2$, 5$, 10$}.
Solved using:Excel (FILTER, LAMBDA, LET), Power Query (List.Transform, Table.FromRows), Python, R, and VBA.
Sales By States!
Challenge No. 69: In Table 1, sales transactions are provided, and the state of each customer is presented in Table 2.
Solved using:Excel (FILTER, HSTACK, LAMBDA), Power Query (Table.AddColumn, Table.Group), Python, R, and SQL.
Character-Based Triangular
Challenge No. 68: Create a formula to receive a number n as input and generate a Triangular with a height equal to n using “*” characters.
Solved using:Excel (IF, LAMBDA, LET), Power Query (List.Repeat, List.Transform, Table.FromColumns), Python, R, and VBA.
Add Index Column! Part 1
Challenge No. 67: In the Question table, indexes along with their ranks in different references are provided.
Solved using:Excel (BYROW, FILTER, LAMBDA), Power Query (List.Skip, List.Transform, Table.SelectRows), Python, R, and VBA.