NDA Government Jobs Exams

If A is a relation on a set R, then which one of the following is correct ?
(a) R ⊆ A (b) A ⊆ R (c) A ⊆ (R ×R) (d) R ⊆ (A×A)

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NDA Other Question

What is the value of logy x^5 logx y^2 logz z^3 ? Let N be the set of natural numbers and f : N → N be a function given by f(x) = x + 1 for x ∈ N. Which one
of the following is correct ?
(a) f is one-one and onto (b) f is one-one but not onto
(c) f is only onto (d) f is neither one-one nor onto