यदि एक समांतर श्रेणी का प्रथम पद $7$ और अंतिम पद $55$ है,तो इसके प्रथम $9$ पदों का योग क्या होगा?

  • A
    $219$
  • B
    $137$
  • C
    $231$
  • D
    $279$

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