What is 9

What is the 15th term; x1=1.5, d=4.5?

Correct result:

x15 =  64.5

Solution:

x1=1.5 d=4.5 n=15  x15=x1+(n−1)⋅ d=1.5+(15−1)⋅ 4.5=1292=64.5

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