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1 আৰু 20-ৰ মাজত কিমানটা মৌলিক সংখ্যা আছে?

A7
B8
C9
D6
Answer & Solution
Correct answer: B. 8
1 আৰু 20-ৰ মাজৰ মৌলিক সংখ্যাবোৰ হ'ল 2, 3, 5, 7, 11, 13, 17 আৰু 19। মুঠ সংখ্যা = 8।
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