Hello Nehal, I've been doing some catching up on these videos. Mr. Alabhya Singh took quiet some time to explain this mathematical problem with the different approaches. I recall that in Germany when i was confronted with the same problem (apply + (range 1 N)), i was taught the Gauss approach (/ (* N (- N 1)) 2) directly. I was not consciously aware that (= (apply + (range 11 20)) (+ (apply + (range 1 10)) (* 10 10))) Nice trick. That makes me recall an childhood incident where i came distressed from Kindergarden (I would have been between 5 and 7) when i realized i ran out of numbers to count.
> My goal was to find the highest number i can count (looking back it's that > i run out of ways to say a number when i try to find the highest number i > can say): > > "one,two,tree,(annoyed pause) this goes till ten like that" > "eleven,twelve,(let's skip the small steps) next is twenty, then > thirty,forty,fifty, this goes to slow as well, i never finish that way, so > next is one hundred, so next is one thousand, ten thousand, one hundred > thousand, thousand thousand, (??) that sounds funny, so it must go on like > "thousand-thousand-thousand-..." and i now can say all the numbers" > It turned out it did not. > I found the next care taker and said "When i grow up i want make > thousand-thousand €" > He answered: "You mean like 2000€?" > I was shocked, 2000 was way smaller than i had in mind. "No like thousand, > ten-thousand, hundred thousand, thousand-thousand, ten-thousand-thousand" > He answered: "It is not thousand-thousand it is called a million" > It dawned on me that for some stupid reason people decided to call > thousand-thousand a million. Why would they want to do that it is way more > fun to say thousand-thousand-thousand than thousand-million? > By the time i was ready to ask the question the staff had left in a hurry
