Abacus|Learn to apply Combination Friend Formula for -6=-10+5-1|Finger Abacus|Finger Maths

Abacus-Finger Abacus-Finger Maths- How and When we need to appply Combination Friend Formula for -6
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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.
In this video i will teach how and when we have to apply combination formula for -6.
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