please solve it fast 85
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so
1050 = 14( 2(10) + (14-1)d)/2
2100 = 14( 20 + 13d)
150 = 20 + 13d
130 = 13d
d = 10
so
20th terms is
a + (20-1)d
10 + 19(10)
200 answer....