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If ALL engineers are intelligent (Statement I), then NO engineer can be non-intelligent. The conclusion contradicts Statement I.

Arrangement from left: T-P-S-Q-R-U. T is at left end, P-S-Q-R is the order given, U must be to the right of R

Pattern: 2¹+1=3, 2³-1=7, 2⁴-1=15, 2⁵-1=31, 2⁶-1=63, 2⁷-1=127. Each is 2ⁿ-1 where n starts at 2

Letters coded by position in alphabet. Z=26, E=5, B=2, R=18, A=1. Answer is 26-5-2-18-1

If all students are hardworking and no lazy person is hardworking, then logically no student can be lazy.

Net: 3 km West, 2 km South (4-2). She is Southwest of home.

Fibonacci sequence where each number is sum of previous two. 8+13=21

From A<B<D and A<C and E is heaviest. Testing: A<B, A<C, B<D, E heaviest. A is lightest.

X is uncle of Y. Y is sister of Z. So X is also uncle of Z. Z is father of W. Therefore, W is nephew of X.

Each letter is shifted backward by 1. G→F, A→Z, R→Q, D→C, E→D, N→M = FZQDCM