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= 7,5 ( 24 + 14 × 3 )
= 7,5 × 66
= 495
b= 3
= a + (n-1) b
= 12 (15-1) 3
= 12 (14) 3
= 54
= ( a + )
= (12 + 54)
= (66)
= 495.