How many numbers can you form using the letters of the word interchangeability? Note you can ignore spaces when forming numbers.

Got this puzzle from my colleague, which he says he made it and says use whatever means to solve, so no problem with posting here. Its the same as this because they put a hold on it,I had to ask it again, with the source as per my knowledge. Trying to solve this puzzle but unable to get with it...

Rules: 1. Start from point A reach back to point A. 2. Each path needs to be visited at least once and only once in each journey. How many different Paths exist?

A girl called Claire suddenly disappeared two weeks ago. She left strange notes before she left. Her parents asked everybody to help find their girl. Last diary entries: [12.02.2019] Prep for mom and dad: ABCD AABC BBCD CDEF [13.02.2019] I can't see his face, he always wears black. Maybe he is...

I'm the essence of every living being But human seem to not understand Even though others are always fleeing They keep using for their demand Soon I will just watch from above How evil and innocent sink to the ground Finally gone with the hate and love They don't see, nobody will be crowned ...

In Colombia, many grassy hillsides are unevenly terraced, like in the photo below. How did this happen? This terracing can also occur on hillsides that never had these palm trees on them. It probably also occurs outside of Colombia, under the right conditions. I think I know the answer, just fr...

This puzzle serves to introduce the ‘Twelve Labours’ series of puzzles. Its solution is standalone and does not contribute to the meta-puzzle at the series end. “Wake up, wake up, wake up! What are you still doing in bed? There’s lots to do – hurry now!” Hercules groaned as his mother stom...

You are a cryptanalyst who works for the US Army. You have been intercepting what is believed to be enemy spies' communiques. However, the documents are very normal looking: Good Morning, The lasagna yesterday was very good. Desmond did not come over to have any and I called him again. Tacos at ...

You're plant-sitting for your friend while he's gone on vacation. Upon getting to the front door, you take out the key ring he gave you. There are a few different keys on it all mixed together. You can’t recall which is the one for his condo. Unfortunately, his advanced home security system will...

there. I came across this puzzle in a primary school booklet for selective high school exams in Australia. Please help me find out the next pattern to appear in the sequence, as shown in the picture below. Thank you very much!