if a 1 =2 and a n -a n-1 =2n(n=2), find the value of a 1 +a 2 +a 3 +.....+a 20.

Question

if a 1 =2 and a n -a n-1 =2n(n>=2), find the value of a 1 +a 2 +a 3 +.....+a 20.

bhawani · Answer

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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if a 1 =2 and a n -a n-1 =2n(n>=2), find the value of a 1 +a 2 +a 3 +.....+a 20.

if a₁=2 and a_n-a_n-1=2n(n>=2), find the value of a₁+a₂+a₃+.....+a_20.

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if a 1 =2 and a n -a n-1 =2n(n>=2), find the value of a 1 +a 2 +a 3 +.....+a 20.

if a1=2 and an-an-1=2n(n>=2), find the value of a1+a2+a3+.....+a20.

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if a₁=2 and a_n-a_n-1=2n(n>=2), find the value of a₁+a₂+a₃+.....+a_20.