19,28,39,52,67............, শূন্যস্থানে কোন সংখ্যাটি বসবে?

A 72

B 84

C 76

D 96

Solution

Correct Answer: Option B

19,28,39,52,67............,
এখানে,
       28-19=9
       39-28=11
       52-39=13
       67-52=15
∴ পরবর্তী পদ =67+17
                     =84

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