# 2nd PUC Mathematics Series 2

PUC Science 2nd Year Mathematics Series-2 quiz

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2nd PUC Mathematics Series 2

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11. If f(x) = 3x+2/5x3 then (fof)(x) is

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12. The number of binary operations that can be defined on a set of 2 elements is

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13. Let * be a binary operation on Q, defined by a * b = 3ab/5 is

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14. Let * be a binary operation on set Q of rational numbers defined as a * b = ab/5. Write the identity for *.

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15. For binary operation * defind on R – {1} such that a * b = a/b+1 is

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16. he binary operation * defind on set R, given by a * b = a+b/2 for all a,b ∈ R is

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17. Let A = N × N and * be the binary operation on A defined by (a, b) * (c, d) = (a + c, b + d). Then * is

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18. Find the identity element in the set I+ of all positive integers defined by a * b = a + b for all a, b ∈ I+.

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19. Let * be a binary operation on set Q – {1} defind by a * b = a + b – ab : a, b ∈ Q – {1}. Then * is

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20. The binary operation * defined on N by a * b = a + b + ab for all a, b ∈ N is