Find the unit digit of .
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The way to solve this problem is by applying congruence modulo First let me explain u congreunce modulo when an integer (a-b) is divisible by 'm' then we represent it in this way a=b(mod m).
In theses sort of problems we must only consider units place.. 2^20 As they are asking units digit we need to take m=10... if they ask Last two digits we need to take 100....... so as we know
2^5=2(mod 10) 2^5*4=2^4(mod 10) [Multiplying the powers by 4] 2^20=16(mod 10) Therefore 6 is the unit's digit