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r=1/49√7
dit : a?
S=a/1-r
a=S(1-r)
a=7+7√7(1-1/49√7)
a=7-1/7√7+7√7-1
a=6+48/7√7
a = S~ (1 - r)
= (7 + 7√7) (1 - (1/49)√7)
= 7(1 + √7) (49 - √7)/49
= 7/49 (49 - √7 + 49√7 - 7)
= 1/7 (42 + 48√7)
= 6/7 (7 + 8√7)