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LAMPARD (1142)

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Olaaa!! Perrrfect answer. 190  [286 rates]

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Z can be written as i(1+3i)13...
=(13C0(3i)0 + 13C1(3i)1 +....)i
Now,collect the imag. terms and the real terms...it will be of the form (x+yi)...
now,modulus=root(x2+y2)...

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