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Mathematics: Post your doubts here!

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It's not an international board but I really want to know how to solve it
 

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the answer is 7 and 10
idk maybe but thanks though
Given that, Sum of First and Fourth term is 70 and sum of Second and Third term is 60, so there's no way the sum to infinity be 10 or 7.

From the answer i posted,

r = 2/3 or 3/2
When r = 2/3,
a = 54
T1 = 54
T4 = 16
Hence T1 + T4 = 70

Again, When r = 3/2

T1 = 16
T4 = 54
Hence T1 + T4 = 70
 
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