Iron pipe rows

Iron pipes are stacked in 10 rows, one above the other, so that the top row has 15 pipes and each row below has one more pipe. How many pipes are there in total?

Final Answer:

s =  195

Step-by-step explanation:

a1=15 n=10 d=1  a10=a1+9 d=15+9 1=24  s=(a10+a1)/2 n=(24+15)/2 10=195



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