Question

In an A.P, if a = -10. n=6 and 4,=10, then the value of d
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Answer 1

Answer:

Given a=-10,n=6 and T4=10

Tn=a+(n-1)d

T4=-10+(6-1)d

10=-10+6d-d

5d-20=0

5d=20

d=4