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OpenStudy (anonymous):
Find the 20th number of this pattern 20,30,40
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OpenStudy (anonymous):
Do you see the relation between these numbers?
OpenStudy (anonymous):
10s
OpenStudy (anonymous):
+ 10, actually! Yep, then what formula should we use?
OpenStudy (anonymous):
Arithmetic can u also do 10x20
OpenStudy (anonymous):
What formula to find the nth element?
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OpenStudy (anonymous):
Idk
OpenStudy (anonymous):
We can't, because it's accumulated! not just add up!
OpenStudy (anonymous):
nth- element a_n = a_1 + ( n -1 ) d Do you know d?
OpenStudy (anonymous):
different d is? ...
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