16 because 0 is not in the 10th place.

vilaspaskanti

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• Feb 6th, 2010

Ans:20.  For tens place we can select 1 digit from 4, for units place we can select 1 from 5as there is no condition specified about digits repeating so 4C1*5C1=20(C-combination).

vineet007

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• Dec 12th, 2006

ans: 16soln: digit in 10s place cannot be 0 => tens place digit can be selected in 4 waysdigit in the units place cannot be tens place digit =>units place digit can be selected in 4 ways=&g...

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11C4

vineet007

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• Dec 12th, 2006

ans :11C4solnnCr-1 + nCr = n+1Cr=> (9C2 +9C3) + 10C4 =   (10C3) + 10C4=    11C4

vineet p sahu

• Dec 12th, 2006

soln: 11C4nCr-1  + nCr = (n+1)Cr=> (9C2 + 9C3) + 10C4  =  (10C3) +10C4=   11C4

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5

vineet007

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• Dec 12th, 2006

ans: 5soln : sum of first 3 terms = 2+3-5 = 0=>sum of first 48 terms = 0=> sum of the remaining 2 terms = 2+3 = 5

vineet p sahu

• Dec 12th, 2006

ans: 3soln:2 + 3 - 5 = 0=> sum of first 48 terms = 0 (since 48%3 = 0)=> last two terms are 2+3 = 5

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