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How many dots are in the 15th step

How Many Dots Are In The 15th Step class=

Sagot :

Answer:

21

Step-by-step explanation:

every step increases by 1

Answer:

210

Step-by-step explanation:

we start at 7 dots in step 1

7+8+9+10+11+12+13+14+15+16+17+18+19+20+21

add all those 210