How many terms are identical in the two A.P.s 21, 23, 25, ....... up to 120 terms and 23, 26, 29, ....... up to 80 terms?

  • A. 39
  • B. 40
  • C. 41
  • D. None of these
 

The correct answer is option B. 40. Can you explain this answer in the comments?


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How many terms are identical in the two A.P.s 21, 23, 25, ....... up to 120 terms and 23, 26, 29, ....... up to 80 terms?