How many years did the late nelson mandela spend in prison after his sentencing in 1962?

He served 27 years

Explanation:

After the sentencing, he served 27 years in 3 different prisons: obben Island, Pollsmoor Prison, and Victor Verster Prison.

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according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

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