Exam Maths Puzzle Category

15 , 9 , 36 , 18 , 61 , 13 , 24 , 18 , 30 , ?

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Exam Other Question

let there is a numbeer 121221222122221222221222222...... find the sum of digits till 1234th term find sum of first 40 terms of series 1^2-2^2+3^2-4^2+....