the sum of five terms of an arithmetic sequence is 60
a) find the middle term.
b) write three arithmetic sequences whose sum of first five terms is 60.
*(please don't answer if you don't know these two questions.)*
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Step-by-step explanation:
a-2d,a-d,a,a+d,a+2d
a-2d+a-d+a+a+d+a+2d=60
5a=60
a=12
b) 10 , 11, 12, 13, 14. d=1
8,10 12,14,16. d=2
6,9,12,15,18. d=3
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