1)С³₆₁=(61!)/(3!(61-3)!)=61!/3!*58!=(59*60*61)/(1*2*3)=35990
C²₆₀=60!/(2!(60-2)!)=60!/2!*58!=59*60/1*2=1770
C³₆₁-C²₆₀=35990-1770=34220
2)C⁵₉+C⁶₉+C⁷₁₀=9!/(5!*4!)+9!/(6!*3!)+10!/(7!*3!)=14+84+120=218
3)∫(9ˣ-eˣ-2x)dx=9ˣ/ln9 -eˣ-x²+C
4)∫₀²(4+12x+9x²)dx=(4x+6x²+3x³)|₀²=8+24+24=56