TCS Company Numerical Ability Averages

consider the sequence 1,-2, 3, -4, 5 what is the average of first 200 terms

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TCS Other Question

-1,0 or 2 in box1 and -A in box 2, A,(A-1),(A+1) box3
get A(A-1)(A-1)A in box-2 and in 3 steps,Use all operations
If A=2/3(B-C) and c=1/2(A+B) and A+B+C=3000, then find C ?