Two APs have the same common difference. The first term of one AP is -1 and that of the other is -8. The difference between their 4th terms is...
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Step-by-step explanation:
. .
=-1 =-8
4= +3 4=+3
=-1+3 =-8+3
30
-1+3-(-8+3)
-1+3+8-3
-1+8=7
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