有几道很简单的题求助各位谢谢啦

************1
out=1
FOR i=1 TO 10
out=out*i
? out
next
************2
out=2
FOR i=4 TO 12 STEP 2
out=out*i
? out
next
************3
out=3
FOR i=6 TO 12 STEP 3
out=out*i
? out
next
************4
out=0
FOR i=5 TO 100 STEP 5
out=out+i
? out
next
4道。