In a theatre, seats are arranged in rows. The fourth row has 19 seats and the eleventh row has 47 se

In a theatre, seats are arranged in rows. The fourth row has 19 seats and the eleventh row has 47 seats. If the number of seats in the theatre forms an arithmetic progression, find the number of seats in the first row.

  1. 7 ✓
  2. 4
  3. 9
  4. 11

Explanation

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