CAT Question of the Day If a2 + b2 + c2 + d2 = 8, find the minimum value of:
3(ab + ac + ad + bc + bd + cd) + 6(a + b + c + d) | OPTIONS | | |  | 1) | –10 | | | 2) | –18 | | | 3) | –12 | | | 4) | None of the above |
Tip of the Day While calculating the weighted average, the ratios of the weights can be used instead of using the actual weights. Also if the weights are equal then the weighted average is same as the simple average. Last year's Question of the day (10-May-11) If the operation '!' is defined for positive X and Y as X ! Y = XY − X, and X ! (X – 1) = 1763, what is the value of X ! (X + 1)?
| OPTIONS | | | | | 1) | 0 | | | 2) | 1681 | | | 3) | 1763 | | | 4) | 1764 | | | 5) | 1849 |
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