the sum of first 15 terms of an ap is 750 and its first term is 15 find its 20 term
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a=15
s15=750
sn =n÷2( 2a+(n-1) d )
750=(7.5)(30+14(d))
100=30 +14d
14d = 70
d=5
20th term is a+19d
15 +19(5)
15+ 95
110
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