Which of the following numbers is divisible by 11?

The sum of all prime numbers less than 20 is:

Given set is (2, 17, 31) is set of:

(a) Prime numbers

(b) Whole numbers

(c) Odd numbers

(d) Even numbers

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If m and n are distinct natural numbers, then which of the following is/are integer(s)?

(A) $m/n + n/m$

(B) $mn(m/n+n/m)(m^2 + n^2)^{-1}$

(C) $mn/(m^2 + n^2)$

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$-\sqrt{8} + \sqrt{128} - \sqrt{32}$ is equal to

Which of the following is/are prime numbers?

(A) 241

(B) 337

(C) 391

(D) 571

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Find the value of $\sqrt{6 + \sqrt{6 + \sqrt{6 + \sqrt{6 + \ldots}}}}$.