13 : 19 : : ? : 31

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Solution

The correct option is C 23
13 and 19 are primes with 17 left out in between.
Thus 23 and 31 with 29 left out.

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Similar questions

Verify the following:

(i) $18 \times [9 + (- 7)] = 18 \times 9 + 18 \times (- 7)$

(ii) $(- 13) \times [(- 6) + (- 19)] = (- 13) \times (- 6) + (- 13) \times (- 19)$

(\frac{21}{13} - \frac{12}{13}) \div \frac{12}{19}

4329 \div 19 + 6464 \div 13 = ?

7 x + \frac{19}{2} = 13

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