In an
a.P if the 6th and the 13th terms are 35 and 70 respectively.Find the sum of the first 20 terms
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a+5d=35
a+12d=70
-7d=35
d=-5
20 the term
a+19d=20
a+(19*-5)=20
a-95=20
a=20+95
a=115
a+12d=70
-7d=35
d=-5
20 the term
a+19d=20
a+(19*-5)=20
a-95=20
a=20+95
a=115
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