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Posted Date: 28 Dec 2007 Posted By: nitha Member Level: Silver Category: Mathematics - Basic

maths

Given: a = i + j + k, a . b = 1 and a × b = j - k. Then, b is equal to

Select Answer:

-2i
2i + k
3j
i

Your Test Score: 0 / 0

Next Question: There is a unique number of ten ciphers, for which the following holds: all ciphers from 0 up to 9 occur exactly once in the number; the first cipher is divisible by 1; the number formed by the first two ciphers is divisible by 2; the number formed by the first three ciphers is divisible by 3; the number formed by the first four ciphers is divisible by 4; the number formed by the first five ciphers is divisible by 5; the number formed by the first six ciphers is divisible by 6; the number formed by the first seven ciphers is divisible by 7; the number formed by the first eight ciphers is divisible by 8; the number formed by the first nine ciphers is divisible by 9; the number formed by the ten ciphers is divisible by 10. Which number is this?

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