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| Answer:80 |
| First person started with 1 (one number). |
| Second person told 2,3 (two numbers). |
| Third person told 4,5,6 (three numbers). |
| As these numbers are told in sequence, nth person tells n numbers ending in n(n+1)/2. |
| [Verify for 1,2,3 values of n] |
| So n(n+1)/2 = 3240 |
| n(n+1) = 6480, implies n=80 |
| Winners:Sravya Ainapurapu and Sruthi Ainapurapu, Sumanth Nethi, Raghu Ainapurapu, Vaasanthi Maghapu. |
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