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The phrase "any number of challenges" is correct and usable in written English.
It can be used to refer to a variety of difficulties or obstacles that one might face, without specifying an exact quantity.
Example: "In the project, we encountered any number of challenges that required creative solutions."
Alternatives: "a variety of challenges" or "numerous challenges".
Exact(5)
Analysts, investors and company executives can rattle off any number of challenges facing the company.
Carcetti faces any number of challenges, from bad crime statistics and floundering schools to the fundamental fact that — as he put it during his run for mayor — "tomorrow morning, I still wake up white in a city that ain't".
THERE are any number of challenges at a furniture gallery opening: signs on the tables reading, "Please Do Not Rest Glass," signs on the chairs reading "Please Do Not Sit".
The program is just getting off the ground, and could face any number of challenges as it grows.
In addition, Prankster Comets have become more general and offer any number of variations: while Super Mario Galaxy offered only five mutually exclusive variations, the Prankster Comets in Super Mario Galaxy 2 range to any number of challenges that often mix or overlap.
Similar(55)
At Miraval, Life in Balance, guests are invited to try any number of "challenge" activities balancing a feather on the palm of the hand, climbing (while tethered) the 25-foot Quantum Leap pole and then jumping off, learning to approach a horse and pick up its hooves.
I'm not under any illusions, there are a number of challenges that I – and the whole of GSoM – face in achieving our long term aims.
With ever more uncertainty around Hulu's talent and content, any buyer will face a number of challenges in making that money back.
As expected in any new program, Asiphile faced a number of challenges.
As in any other applications of epidemiology, these models face a number of challenges and dangers.
Any Israeli attack against Iran's nuclear facilities would confront a number of challenges.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com