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How many numbers from 11 to 50 are there which are exactly divisible by 7 but not by 3 ?11 से 50 तक ऐसी कितनी संख्याएँ हैं जो 7 से पूर्णतया विभाजित होती हैं परन्तु 3 से नहीं ?

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Correct answer: B. 4

Explanation

Multiples of 7 between 11 and 50 are 14, 21, 28, 35, 42 and 49. Of these, 21 and 42 are also divisible by 3 and must be removed, leaving 14, 28, 35 and 49 — that is 4 numbers.11 से 50 के बीच 7 के गुणज हैं — 14, 21, 28, 35, 42 तथा 49। इनमें 21 तथा 42, 3 से भी विभाजित होते हैं और हटा दिए जाएँगे; शेष रहे 14, 28, 35 तथा 49 अर्थात् 4 संख्याएँ।

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