railway RRB ALP (CBT 1 + CBT 2 + CBAT) Mock Test Series 2025 (New) Quantitative Aptitude Number System Prime Numbers

20 থেকে 50 এর মধ্যে কয়টি মৌলিক সংখ্যা আছে?

1

8

2

5

3

6

4

7

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