Challenge No. 342: List the valid South African National IDs (person identification numbers).
Solved using: Python in Excel.
LAMBDA
Creates custom reusable functions in Excel.
Sort odd positioned numbers
Challenge No. 341: Sort the numbers at odd positions.
Solved using: Python in Excel.
People Connection!
Challenge No. 200: In the question table, direct connections between people are provided.
Solved using:Excel (IF, IFNA, INDEX), Power Query (List.Transform, Text.End), Python, Python in Excel, and R.
Create half-yearly sorted table from data
Challenge No. 340: From dataset in column A, create the table under Answer Expected.
Solved using: Python in Excel.
Find the Nth Fibonacci number
Challenge No. 339: A Fibonacci number is a sum of previous two terms starting with 0 & 1.
Solved using: R.
Column Combining! Part 2
Challenge No. 199: Given multiple columns, concatenate them based on the order presented on the pattern column using space as a delimiter.
Solved using:Excel (BYROW, CHOOSECOLS, DROP), Google Sheets, Power Query (List.Transform, Text.Combine, Text.Split), Python, Python in Excel, and R.
Calculate check digit using Damm algorithm
Challenge No. 338: Calculate check digit using Damm algorithm.
Solved using: Python in Excel.
Count of numbers where digits’ product equals value
Challenge No. 337: Find the Min, Max and Count of numbers having number of digits in column A whose product of digits is equal to column B.
Solved using: R.
Matrix Calculation! Part 2
Challenge No. 198: Create a formula that, for any ‘n x n’ matrix, calculates z1 to zn, where zi is the sum of all the values in the ith row and the ith column of the matrix.
Solved using:Excel (BYCOL, INDEX, LAMBDA), Google Sheets, Power Query (List.Transform, Table.FromRows, Table.ToColumns), Python, Python in Excel, and R.
Find unique number pairs
Challenge No. 336: Find the unique pair of numbers.
Solved using: Python in Excel.