A union bracket B intersect c bracket close is equal to bracket a union b bracket close intersect a union see

^{a sets a union b union B intersect see is equal to a union b bracket intersect bracket a union C prove that}

How many terms of the AP:9,17,25,.......must be taken to give a sum of 636

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(1) |2x-3| < x-1

(2) |x-1| >= |x-3|

(3) | | x-1| - 1| <= 1 |

Write the first three terms of the sequence an = (-1)^n-1 5ⁿ⁺¹