Permutations and Combinations Part 1
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Let b 1 b 2 b 3 b 4 be a 4-element permutation with b i ∈ { 1 , 2 , 3 , . . . . . . . , 100 } for 1 ≤ i ≤ 4 and b i ≠b j for i ≠j , such that either b 1 , b 2 , b 3 are consecutive integers or b 2 , b 3 , b 4 are consecutive integers. Then the number of such permutations b 1 b 2 b 3 b 4 is equal to___
[29-Jun-2022-Shift-1]
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