fix(challenges): Edit Description and Add Solution for Project Euler 45 (#17126)

Updated the problem description with an inline CSS grid, <sup>, and
<var> tags. Also added a solution that user @elliotjz contributed
to the fCC Arcade Mode.

BREAKING CHANGE: None

Author: scissorsneedfoodtoo

challenges/08-coding-interview-questions-and-take-home-assignments/project-euler-problems.json

@@ -1604,36 +1604,24 @@
       "type": "bonfire",
       "title": "Problem 45: Triangular, pentagonal, and hexagonal",
       "tests": [
-        "assert.strictEqual(euler45(), 1533776805, 'message: <code>euler45()</code> should return 1533776805.');"
+        "assert.strictEqual(triPentaHexa(40756), 1533776805, 'message: <code>triPentaHexa(40756)</code> should return 1533776805.');"
       ],
-      "solutions": [],
+      "solutions": ["function triPentaHexa(n) {\n  function triangular(num) {\n  return (num * (num + 1)) / 2;\n}\n\nfunction isPentagonal(num) {\n  // Formula found by completing the square and\n  // solving for n.\n  const n = (Math.sqrt((24 * num) + 1) + 1) / 6;\n  return n % 1 === 0;\n}\n\n  function isHexagonal(num) {\n  // Formula found by completing the square and\n  // solving for n.\n  const n = Math.sqrt(0.5 * (num + (1 / 8))) + 0.25;\n return n % 1 === 0;\n}\n\nlet iTri = n;\nlet tri;\nlet found = false;\nwhile (!found) {\n  iTri++;\n  tri = triangular(iTri);\n  if (isPentagonal(tri) && isHexagonal(tri)) {\n    found = true;\n    }\n  }\n  return tri;\n}"],
       "translations": {},
       "challengeSeed": [
-        "function euler45() {",
+        "function triPentaHexa(n) {",
         "  // Good luck!",
         "  return true;",
         "}",
         "",
-        "euler45();"
+        "triPentaHexa(40756);"
       ],
       "description": [
         "Triangle, pentagonal, and hexagonal numbers are generated by the following formulae:",
-        "Triangle",
-        "",
-        "Tn=n(n+1)/2",
-        "",
-        "1, 3, 6, 10, 15, ...",
-        "Pentagonal",
-        "",
-        "Pn=n(3n−1)/2",
-        "",
-        "1, 5, 12, 22, 35, ...",
-        "Hexagonal",
-        "",
-        "Hn=n(2n−1)",
-        "",
-        "1, 6, 15, 28, 45, ...",
-        "It can be verified that T285 = P165 = H143 = 40755.",
+        "<div style='display: inline-grid; text-align: center; grid-template-columns: repeat(3, minmax(117px, 12%)); grid-template-rows: auto;'><div>Triangle</div><div>T<sub>n</sub>=<var>n</var>(<var>n</var>+1)/2</div><div>1, 3, 6, 10, 15, ...</div></div>",
+        "<div style='display: inline-grid; text-align: center; grid-template-columns: repeat(3, minmax(117px, 12%)); grid-template-rows: auto;'><div>Pentagonal</div><div>P<sub>n</sub>=<var>n</var>(3<var>n</var>−1)/2</div><div>1, 5, 12, 22, 35, ...</div></div>",
+        "<div style='display: inline-grid; text-align: center; grid-template-columns: repeat(3, minmax(117px, 12%)); grid-template-rows: auto;'><div>Hexagonal</div><div>H<sub>n</sub>=<var>n</var>(2<var>n</var>−1)</div><div>1, 6, 15, 28, 45, ...</div></div>",
+        "It can be verified that T<sub>285</sub> = P<sub>165</sub> = H<sub>143</sub> = 40755.",
         "Find the next triangle number that is also pentagonal and hexagonal."
       ]
     },