Combinatorics problem! (Probably easy)

Probability Level 3

Find the number of ways in which we can select three integers from the set of integers, {1,2,3,4,5,6,7,................,47,48,49} \{1,2,3,4,5,6,7,................,47,48,49\} such that no two are consecutive

BonusBonus: Prove this for selecting rr integers from first nn natural numbers such that no two are consecutive.

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