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In an arithmetic sequence, T1=4 and T7=22.

Using Simultaneous equations find the values of a and d.

User Zbdiablo
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Answer:

Explanation:

t1 means a1 and t7 means a7

a+(n-1)d=an

a+(1-1)d=4

so we get a as 4

a=4

a+(n-1)d=an

4+(7-1)d=22

4+6d=22

6d=22-4

d=18/6

d=3

User Nathan Liang
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