Question (3/85)

Find the value of expression:

`1/(1 + X^(b - a) + X^(c - a)) +1/(1 + X^(a - b) + X^(c - b)) +1/(1 + X^(b - c) + X^(a - c))`

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(A)  1

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(B)  X

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(C)  1/X

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(D)  3/X

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Question (4/85)

Find the value of expression: `1/(1 + a^(n - m)) +1/(1 + a^(m - n))`

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(A)  1

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(B)  a

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(C)  1/2

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(D)  a/2

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