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![[Post New]](/templates/default/images/icon_minipost_new.gif) 21 Feb 2008 07:38:57 IST
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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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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
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21 Feb 2008 12:18:12 IST
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--
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TECHNOLOGY IS MY WORLD.
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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.....
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I always like to walk in rain as no one can see me crying there :(
frnds are like diamonds , if u hit them , they don't break but they slip frm ur hands
-----It is better to be hated for what you are than to be loved for what you are not.----
*****wen love and skill work together--expect a masterpiece*****
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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.
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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
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I always like to walk in rain as no one can see me crying there :(
frnds are like diamonds , if u hit them , they don't break but they slip frm ur hands
-----It is better to be hated for what you are than to be loved for what you are not.----
*****wen love and skill work together--expect a masterpiece*****
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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) ! mPn
and wen second type of things always comes together
den = m! n!
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I always like to walk in rain as no one can see me crying there :(
frnds are like diamonds , if u hit them , they don't break but they slip frm ur hands
-----It is better to be hated for what you are than to be loved for what you are not.----
*****wen love and skill work together--expect a masterpiece*****
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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!
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3 Mar 2008 06:37:21 IST
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cum on just do it
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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 xx involves logarithmic concepts.
Heres one of my observation in doing so:
If u have a general term, say y= ab
Differentiating with respect to x we get:
dy/dx= ab {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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