question no. B) 1 and 2
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2) a= 6
d= -2
S 10 = 5 (12 - 18)
5 × -30 =- 150 ans
d= -2
S 10 = 5 (12 - 18)
5 × -30 =- 150 ans
sunshine1234:
d= -2
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