Digital sum of a number is obtained by adding all the digits of a number until a single digit is obtained. Find the digital sum of $19^{100}$ .

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Solution

The correct option is A 1
Digital sum of $(19)^{100}$ = Digital sum of $(1 + 9)^{100}$
= Digital sum of $(10)^{100}$ = Digital sum of $(1 + 0)^{100}$
= Digital sum of $(1)^{100}$ = 1

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Digital sum of a number is obtained by adding all the digits of a number until a single digit is obtained. Find the digital sum of 19100.

The correct option is A 1Digital sum of (19)100 = Digital sum of (1+9)100 = Digital sum of (10)100 = Digital sum of (1+0)100 = Digital sum of (1)100 = 1

Digital sum of a number is obtained by adding all the digits of a number until a single digit is obtained. Find the digital sum of $19^{100}$ .

The correct option is A 1
Digital sum of $(19)^{100}$ = Digital sum of $(1 + 9)^{100}$
= Digital sum of $(10)^{100}$ = Digital sum of $(1 + 0)^{100}$
= Digital sum of $(1)^{100}$ = 1