Sum of all the digit of the number 10⁷⁸ – 21

<p><span lang="EN-IN">Let us find the pattern </span></p><p><span lang="EN-IN">10⁴ – 21 = 9979 </span></p><p><span lang="EN-IN">10⁶ – 21 = 999979 </span></p><p><span lang="EN-IN">10⁸ – 21 = 99999979 </span></p><p><span lang="EN-IN">.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .</span></p><p><span lang="EN-IN">.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .</span></p><p><span lang="EN-IN">.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .</span></p><p><span lang="EN-IN">10ⁿ– 21 = 999 (n–2times) 79</span></p><p><span lang="EN-IN">When, n = 78</span></p><p><span lang="EN-IN">10⁷⁸ – 21 = 999 (76times) 79 </span></p><p><span lang="EN-IN">Sun of all digit = 77 * 9 + 7</span></p><p><span lang="EN-IN">= 693 + 7 = 700</span></p>

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