19. In an A.P.. the first term is 8, nth...

19. In an A.P.. the first term is 8, nth term is 33 and sum to first n terms is 123. Find n and d, the common difference. एक समान्तर श्रेढ़ी का प्रथम पद 8, nवाँ पद 33 तथा प्रथम n पदों का योगफल 123 है । तथा d (सार्व अन्तर) ज्ञात कीजिए।

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