Added problems till 60 to ipynb.

ipython/EulerProblem053.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Combinatoric selections (Euler Problem 53)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "collapsed": true
+   },
+   "source": [
+    "[https://projecteuler.net/problem=53](https://projecteuler.net/problem=53)\n",
+    "\n",
+    "There are exactly ten ways of selecting three from five, 12345:\n",
+    "\n",
+    "$123, 124, 125, 134, 135, 145, 234, 235, 245, 345$\n",
+    "\n",
+    "In combinatorics, we use the notation, 5C3 = 10.\n",
+    "\n",
+    "In general,\n",
+    "\n",
+    "$nCr = \\frac{n!}{r!(n−r)!}$, where r ≤ n, n! = n×(n−1)×...×3×2×1, and 0! = 1.\n",
+    "\n",
+    "It is not until n = 23, that a value exceeds one-million: 23C10 = 1144066.\n",
+    "\n",
+    "How many, not necessarily distinct, values of  nCr, for 1 ≤ n ≤ 100, are greater than one-million?"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "completion_date": "",
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+   "language": "python3.6",
+   "name": "python3"
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+}