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## Answers

Ans is 2403...............

Let s=2+3+6+11+18............tn

s= 2+3+ 6 +11+18......tn-1+tn

subtract the above two equations and you will notice that difference is in A.P.

that is 1,3,5,7...and hence you can solve

s= 2+3+ 6 +11+18......tn-1+tn

subtract the above two equations and you will notice that difference is in A.P.

that is 1,3,5,7...and hence you can solve