Question

Tom exchange a friendship band with his friends for everyband he gives someone he gets 9 bands back support starts the exchange with just one band how many bands will he have after 80 exchange

Answer 1

Answer:641

Step-by-step explanation:

After 1st exchange Tom have 9 bands

After 2nd exchange Tom have (9-1+9)=17 bands

After 3rd exchange Tom have (17-1+9)=25 bands

.

.

.After 80th exchange Tom have

(1+8*80)=641

Answer 2

Answer:

641

Step-by-step explanation:

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