On the 11th, a pilgrim stones after zawāl. He throws seven pebbles at each station: 7 + 7 + 7 = 21 throws.
He makes supplication after the first and second stations, not after the third. If he stones only Aqabah with seven pebbles, he has not completed the prescribed three-station rite for that day.
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Book of Hajj: Return to Mina, Stoning the Three Jamarahs, and Days of Tashriq
On the 11th, a pilgrim stones after zawāl. He throws seven pebbles at each station: 7 + 7 + 7 = 21 throws.
He makes supplication after the first and second stations, not after the third. If he stones only Aqabah with seven pebbles, he has not completed the prescribed three-station rite for that day.