Question

Find the rightmost non zero digit of the number 30^2720

Answer 1

Hey Friend ☺

There are 2720^2 zreos in 30^2720 .

Hope it helps you .!!

✌

Answer 2

Answer:

What is the rightmost non-zero number of 30^2720?

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4 Answers

Mainak Das

, Associate at State Bank of India (2019-present)

Answered 3 years ago

the right most non zero digit will be 1

Let's see HOW??

30^2720 =( 3×10)^2720=3^2720×10^2720

Now the second part ie. 10^2720 will only produce zeros , so neglect that part,

for the first part3^2720

3^1=3 unit digit 3

3^2=9 unit digit 9

3^3=27 unit digit 7

3^4=81 unit digit 1

3^5=243 unit digit once again 3

So here we can see power of 3 only produce 4 different unit digits, it happened in a cyclic order “3,9,7,1”. so let's divide 2720 by 4

2720÷4 =680 NO REMAINDER

So we can say that the cyclic order will complete and at the end the power will be

3^4 =81

So 3^2720 will have 1 as unit digit which will be the right most non zero digit.

the right most non zero digit will be 1

hope it is helpfull please make me brainlist