if a1=2 and an-an-1=2n(n>=2), find the value of a1+a2+a3+.....+a20.
Atish Dutta , 9 Years ago
Grade 11
Algebra> if a 1 =2 and a n -a n-1 =2n(n>=2), find ...
1 Answersbhawani
Last Activity: 9 Years ago
420
tn= 2 + { 4 + 6 + 8 + 10 + – – – – + 19 terms}
=2 + 19/2{2.4 + (19 – 1 )2}
2 + 19/2{ 8 + 36}
=420
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