In the front row sitting three students and in every other row 11 students more than the previous row. Determine how many students are in the room when the room is 9 lines, and determine how many students are in the seventh row.

Correct result:

x =  423
a7 =  69


a=3 d=11 n=9 b=a+(n1) d=3+(91) 11=91 x=n (a+b)/2=9 (3+91)/2=423a=3 \ \\ d=11 \ \\ n=9 \ \\ b=a+(n-1) \cdot \ d=3+(9-1) \cdot \ 11=91 \ \\ x=n \cdot \ (a+b)/2=9 \cdot \ (3+91)/2=423
a7=a+(71) d=3+(71) 11=69a_{7}=a+(7-1) \cdot \ d=3+(7-1) \cdot \ 11=69

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