Identify the logic gates marked 'P' and 'Q' in the given circuit. Write the truth table for the combination.

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#### Solution

P - NAND GATE

Q - OR GATE

Assume:

`X'=bar(A.B)`

A | B |
`X'=bar(A.B)` |
X |

0 | 0 | 1 | 1 |

0 | 1 | 1 | 1 |

1 | 0 | 1 | 1 |

1 | 1 | 0 | 1 |

Concept: Digital Electronics and Logic Gates

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