If ω is an imaginary cube root of unity, then the value of. Image attached
sohan goswami , 6 Years ago
Grade 12th pass
Algebra> If ω is an imaginary cube root of u...
2 Answers
Amit
Last Activity: 6 Years ago
Hi there. If you want to solve such questions fast replace value of n in ques and well as options .. here replace n=1. To get original statement as zero .. also by replacing n=1 in option A we are getting it zero.. Thats a trick or shortcut..
Samyak Jain
Last Activity: 6 Years ago
Let S = (2 – 
)(2 – 2) + 2(3 – )(3 – 2) + …............. +(n – 1)(n – )(n – 2)
General term of S, Tr = (r – 1)(r – )(r – 2)
= (r – 1)[r2 – ( + 2)r + 3]
= (r – 1)(r2 + r + 1) [
1 + + 2 = 0]
= r3 + r2 + r – r2 – r – 1
= r3 – 1
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