Ndindu
October 17, 2020, 11:26am
1
4 x 9 = 36
49 x 1 = 49
16 x 4 = 64 etc
A number is divisible by 3 if the sum total of its digits is divisible by 3 e.g 18. 1+8=9, 9/3=3 etc
In a room of 23 people there is 99% chance two people have the same birthday. Tafakari
“Eleven plus two” is an anagram of “twelve plus one” which is pretty fitting as the answer to both equations is 13.
-40 °C is equal to -40 °F.
(a)^2 x (b)^2 = (ab)^2
Divisibility rule. https://math.stackexchange.com/questions/341202/how-to-prove-the-divisibility-rule-for-3-casting-out-threes
3Wrong that’s the. Birthday paradox. (1-(364/365)^(253))*100 = 50.047715403% chance
13+2 =12+3, 10+1=11+0, 13+1 =11+3, 11+9=19+1, 99+1=91+9 etc not special. any two digit number added to a single digit does the same.
proof:
given three numbers a ,b and c between 0 and 9
(10a+b) + c =10a +b +c = (10a+c) +b
5.(-40°F − 32) × 5/9 = -40°C