Math Is Fun Forum

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It would take more than triple the time to solve with these formulas than solving it by factorizing. Lol. Factorization is a much better process

Bobbym , When I'm clicking on this link it is showing "Your search returned no hits"

Hi, It is an outstanding formula. Though impossible to memorize we can look it up if necessary. I want to know who has derived it and how has it been derived.

And yeah please tell me a similar direct formula to solve cubic equations also. It would be vey helpful to me.

Yeah then we would be getting

( √2- √1)( √3- √2)( √4- √3)........( √100- √99)

Then, how we will proceed next.

Read "What is infinity" in Mathsisfun

URL:http://www.mathsisfun.com/numbers/infinity.html

There is 1 more trick extremely simple. For the trick you need to memorise the key of month and day. The key of month is different for different centuries. Since the 20th and the 21st centuries are mostly required so I am giving the key of these 2 centuries only.
20th century
Jan-1
Feb-4
Mar-4
Apr-0
May-2
Jun-5
Jul-0
Aug-3
Sep-6
Oct-1
Nov-4
Dec-6

21st century
Jan-7
Feb-3
Mar-3
Apr-6
May-1
Jun-4
Jul-6
Aug-2
Sep-5
Oct-7
Nov-3
Dec-5

Day key
Sun-1
Mon-2
Tue-3
Wed-4
Thu-5
Fri-6
Sat-0

Procedure: To find the  day perform this calculation:

(L+L/4+M+D)MOD7
where, L=last 2 digits of yr.
           M=month key
            D=date
           
After the remainder is obtained match it with the day key to find the day on which that respective date falls!!!

Note:-During calculations, drop off the digits after the decimal point.

In Fibbonacci sequence the next term is found by adding the previous 2 terms. But if we add all the previous terms before it to get the next no. we will get

1,1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192..........
which is nothing but powers of 2.So,it is actually
2^0,2^0,2^1,2^2,2^3,2^4,2^5,2^6.........

Yeah thickhead you are right.