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  2. 30 by 30 - Wikipedia

    en.wikipedia.org/wiki/30_by_30

    30 by 30 (or 30x30) is a worldwide initiative for governments to designate 30% of Earth's land and ocean area as protected areas by 2030. [1] [2] The target was proposed by a 2019 article in Science Advances , "A Global Deal for Nature: Guiding principles, milestones, and targets", highlighting the need for expanded nature conservation efforts ...

  3. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...

  4. 30 (number) - Wikipedia

    en.wikipedia.org/wiki/30_(number)

    In mathematics. 30 is a square pyramidal number. 30 is an even, composite, pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of the form , where r is a prime greater than 3. It has an aliquot sum of 42, which is the second sphenic number. It is also:

  5. The juice isn’t worth the squeeze for many college majors ...

    www.aol.com/finance/juice-isn-t-worth-squeeze...

    Now there’s another thing to fear: Even if having a degree leads to higher earning potential down the line, a new analysis says about 30% of students won’t earn enough money to offset the ...

  6. Suicide methods - Wikipedia

    en.wikipedia.org/wiki/Suicide_methods

    As of 2006, worldwide, around 30% of suicides were from pesticide poisonings. It was the leading suicide method in developing countries , [42] with about half of suicide deaths in India involving poisoning, and most of those involving pesticides. [43]

  7. Energy-efficient home improvements that can help lower taxes ...

    www.aol.com/energy-efficient-home-improvements...

    The Energy Efficient Home Improvement Credit allows homeowners to claim 30% of qualified expenses up to $3,200, each year they make improvements. That means homeowners can claim credit for ...

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