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The sum of the first six term of an arithmetic progression whose first term is 1 is equal to the sum of the first six terms of the geometric progression beginning 1, 2, 4, ...  Find the sixth term of the arithmetic progression.

 Dec 18, 2019

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Sum of GP =1, 2, 4, 8, 16, 32 =63
Sum of AP =[F + L] / 2 * N
     63         =[1 + L] / 2 * 6, solve for L
L = 20 - Last term (6th term) of the AP 

 Dec 18, 2019
 #1
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+1
Best Answer

Sum of GP =1, 2, 4, 8, 16, 32 =63
Sum of AP =[F + L] / 2 * N
     63         =[1 + L] / 2 * 6, solve for L
L = 20 - Last term (6th term) of the AP 

Guest Dec 18, 2019

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