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There two chairs, one electrified and one non electrified and there two persons one always says truth other always lies. you have to ask a single question to one of them and find out which one is the electrified chair?

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The sequence is defined by A(1)=2 and A(n+1)=A(n)+2n.
What is the value of A(100)
(1)9902
(2)9900
(3)10100
(4)9904
what is the unit digit of 21^3*21^2*34^7*46^8*77^8 ?