CBSE BOARD X, asked by triptadhanuka1982, 11 months ago

I am confused with the logic behind it . The answer is given (d). please help me.​

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Answered by praveenthegreat
1

Answer:

because before 2 1 occurs and before5 4 occurs and before 9 8 occurs so therefore 259=149

then before 13 12 and 15=15 and before20 19

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