I need all answers for 4 questions

I Find the value of R in the astable multivibrator (using gates) circuit, if C 0.01HF, and the fre quency of the astable multivibrator is 3 KHz. Drawthe output waveforms of the two gates and the input waveform of first gate marking all important levels, assuming Vcc5V (2.5 Marks) Il Ina RC charging circuit, given R 50 Kohm, S upply voltage- 15 V and voltage across the capacitor is 5 V after time t 15 ms. Find the value of the capacitor used (2.5 Marks) IlII Drawthe circuit diagrams for three input OR gate using Diodes & using Transistors Write its Truth Table. (2.5 Marks) Draw a circuit diagram for implementing the logic expression Y=(A+B)(C + D) using two input OR and AND gates us ing diodes. (2.5 Marks)