**Example 1.**

If is the imaginary cube root of unity, then value of the expression

is

(a)

(b)

(c)

(d)

**Answer. (a).**

**Solution:**

rth term of the given expression is

because .

Thus, the value of the expression is given by

More later,

Nalin Pithwa

Mathematics demystified

**Example 1.**

If is the imaginary cube root of unity, then value of the expression

is

(a)

(b)

(c)

(d)

**Answer. (a).**

**Solution:**

rth term of the given expression is

because .

Thus, the value of the expression is given by

More later,

Nalin Pithwa

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