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by kvcpk » Sun Aug 01, 2010 11:06 pm
s = 100*101*....200
t = 100*101*.....200*201
t = s*201

1/s + 1/t = (t+s)/st

(t/201 + t)/ (t^2/201)
202t/t^2
202/t

pick D
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by pradeepkaushal9518 » Sun Aug 01, 2010 11:08 pm
ok so this is the way
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by arora007 » Sun Aug 01, 2010 11:08 pm
s= 100*....*200
t= 100*....*200*201

effectively s=t/201 (since we want the answer in terms of t)

now 1/s + 1/t = 1/(t/201) + 1/t

which is (201/t) + 1/t

base is same and taking out common... 201 and 1 add up
giving 202/t answer is D pretty simple!
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by selango » Sun Aug 01, 2010 11:09 pm
S*t=100..*200

t=100*...201

1/s+1/t=s+t/st=(100*...200)+(100*...201)/((100*...200)*(100*...201))

=(100*...200)(1+201)/(((100*...200)*(100*...201)))

=202/(100*...201)=202/t

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