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General Physics

Scorching goIITian

Joined:	9 Jun 2007
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21 Feb 2008 07:38:57 IST

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2450

tricks mania

None

hurry ppl posts oyur tricks and shortcuts to solving problems and earn valuable rates and points ..its useful for upcuming exams too............................

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Ashwin R

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Joined: 27 Dec 2007

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21 Feb 2008 08:08:15 IST

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to add consecutive 10 numbers.......
jus put a 5 as the last digit to the fifth number for example

for first ten numbers..........put a 5 to the 5th num...
55 is the answer

Anurag Bothra

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Joined: 26 Feb 2007

Posts: 114

21 Feb 2008 12:18:12 IST

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Himanshu

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Joined: 19 Feb 2007

Posts: 3834

22 Feb 2008 06:54:18 IST

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How bout dis 1

in qs....wen u r given like

find the sum of numbers formed by using n numbers

eg. find the sum of numbers formed by taking all da given digits of 2,3,4,5

its a very simple trick....

the formula is

(sum of all da digits) x (n - 1)! x (1.1.1.1............n times)

where n is no. of digits

like here in dis case , n = 4 (2 , 3 , 4 , 5.......4 no.s)

so its simple

(2 + 3 + 4 + 5) (3)! (1111)...............as n = 4 so 1111

18 x 6 x 1111 = 93324

dese typeof qs can be asked in JEE.....infact dis example is a JEE qs....

cheers!!!!!!!!!!

no zeros must be der in qs.....n no repitition of digits allowed.....

$^Mujtaba^$

Blazing goIITian

Joined: 15 Nov 2007

Posts: 436

22 Feb 2008 23:39:33 IST

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Dear, 2+3+4+5=14 and not 18 as u hav done in the following:

(2 + 3 + 4 + 5) (3)! (1111)...............as n = 4 so 1111

18 x 6 x 1111 = 93324

Also 18x6x1111=119988 and not 93324.........and 14x6x1111=93324

But let it go bcoz its just an example.

Himanshu

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Joined: 19 Feb 2007

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23 Feb 2008 14:38:33 IST

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yup dude

it was 2+3+4+5 = 14...

sorry

Himanshu

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Joined: 19 Feb 2007

Posts: 3834

24 Feb 2008 00:25:14 IST

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1 more

the no. of ways in wich m (one type of diff.) things nd n different things (m >= n) can be arranged in a circle so dant no 2 things of second (n) kind come together

= (m - 1) ! ^mP_n

and wen second type of things always comes together

den = m! n!

sivarama krishnan

Scorching goIITian

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24 Feb 2008 06:05:42 IST

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A basic trick in trigonometry would be to apply am>=gm formula for positive ratios.
Another basic trick in multiple choice questions would be to find the answer by substituting the values for variables.
Another trick is elimination.Eleminate the wrong answers by logical argument. The choice that remains is the right one!

sivarama krishnan

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3 Mar 2008 06:37:21 IST

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cum on just do it

$^Mujtaba^$

Blazing goIITian

Joined: 15 Nov 2007

Posts: 436

7 Mar 2008 23:59:52 IST

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Differentiation

Differentiating the common expressions is quite easy but differentiation of terms having powers ie x^x involves logarithmic concepts.
Heres one of my observation in doing so:

If u have a general term, say y= a^b
Differentiating with respect to x we get:
dy/dx= a^b{b/a. da/dx + log(a).db/dx}

Couldn't make it more simple due to malfunctioning of formula editor.
Hope yoll find it useful.
Pls rate.

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