Abacus-Finger Abacus-How and When we have to apply combination friend formula+7=+10-5+2- ABC Tube TV

Abacus-Finger Abacus-How and When we have to apply combination friend formula+7=+10-5+2- ABC Tube TV
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Hi friends, in this video we will learn what the combination formula is in an abacus and how and when we apply the combination formula while we do calculations with a finger abacus.for more video you can visit
finger abacus zero to hero playlist : https://www.youtube.com/playlist?list=PLZ67c1-XfKx578GRFv4pjW1h6VcCZ1l_n
and finger abacus playlist : https://www.youtube.com/playlist?list=PLZ67c1-XfKx44ts2ogMbst4vsnguaRzRr