allery13, 17, 19 আৰু 21 ৰ ভিতৰত কোনটোৰ 1 আৰু নিজৰ বাহিৰেও অন্য এটা উৎপাদক আছে?
A17
B13
C21
D19
Answer & Solution
Correct answer: C. 21
21 হ'ল 3 x 7 ৰ সমান, গতিকে ই দুটা সৰু স্বাভাৱিক সংখ্যাৰ পূৰণফল, আনহাতে আনবোৰৰ এনে কোনো বিভাজন নাই।
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