TCS Company Numerical Ability Number System

What is the value of (44444445*88888885*44444442+44444438)/44444444^2

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TCS Other Question

if x^y means x to the power y then
f(x)=1+x+x^2+....+x^6 then the reminder when f(x^7) is devided by f(x)
two circles of radii 5 cm and 3 cm touch each other at A and also touch each other a at line B and C. the distance BC in cms is??

a) 4144
b) 8192
c) 256
d) 102