Enthusiasts 4032

There are 147 students in seven years at the wizarding academy. Enthusiasts for magic are increasing, so since 2006, they have accepted two more students each year than the previous year. How many students do they have in their first year?

Correct answer:

a =  0

Step-by-step explanation:

s7=147 d=2 n=7 sn = n   (a1+an)/2 = n   (a1+a1+(n1)d)/2 2 s7 = 7 (2a1+6d)  a1 = s7/7  3d a=a1=s7/73 d=147/73 (2)=27=0

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