The maximum & minimum magnitude of resultant of two given vectors are 17 units & 7 unit respectively

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The maximum and minimum magnitude of the resultant of two given vectors are 17 units and 7 unit respectively. If these two vectors are at right angles to each other, the magnitude of their resultant is:
(A) 14 (B) 16
(C) 18 (D)13
Answer: (D)13
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