IIT JEE , AIEEE Forum - Mathematics , Algebra

Decoder

my way..or highway!!..

for unit place try to get (10m +/- 1)^n form expression...
for ten's place..try to get (100m +/- 1)^n form of expression...

if u don't get the latter one..question will have n as a multiple of ten..

write the expression as ( 10 - 1) ^50..

expand ..u get all terms ending wid a zero except last one..i.e 1..

so unit's place is one..

now for ten's place ...
again expand...u will see every term is actually ending wid two zeroes ...except last one..so tens digit is zero...

so correct options r a).b)

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