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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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