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Diketahui barisan aritmetika dengan suku ke-9 = 51 dan suku ke-13 = 79 . Suku ke-36 adalah ....

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$U n t u k space m e n c a r i space b e d a space d e r e t space a r i t m a t i k a space d a p a t space m e n g g u n a k a n space r u m u s colon b equals fraction numerator U subscript m minus U subscript n over denominator m minus n end fraction m a k a space b e d a space d e r e t space a r i t m a t i k a space p a d a space s o a l space a d a l a h colon b equals fraction numerator U subscript 13 minus U subscript 9 over denominator 13 minus 9 end fraction equals fraction numerator 79 minus 51 over denominator 4 end fraction equals 7 U n t u k space m e n c a r i space s u k u space k e space n space p a d a space d e r e t space a r i t m a t i k a space m e n g g u n a k a n space r u m u s U subscript n equals a _ plus left parenthesis n minus 1 right parenthesis b M a k a colon U subscript 6 equals a plus 5 b equals left parenthesis a plus 8 b right parenthesis minus 3 b equals U subscript 9 minus 3 b equals 51 minus 3 left parenthesis 7 right parenthesis equals 30$