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OpenStudy (anonymous):
Find the twentieth term if a36 = 78 and a42 = 90.
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OpenStudy (anonymous):
From this,u get two equations......as .......a(n)=a+(n-1)d a36=a+35d=78 a42=a+41d=90
OpenStudy (anonymous):
Solve both a and d, then use a20=a+19d.find the answer!!Cheers!!
OpenStudy (anonymous):
Thanks!
OpenStudy (anonymous):
No probs!!
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