6. Suppose you have 105 blocks. You want to stack up all the blocks so that each row has one less block than the row below. You want to end up with just 1 block on top. How many should you put in the bottom row?

Suppose that we have 10 numbered blocks, 2 RED, 3 BLUE, 4 GREEN, and one WHITE.  How many ways can we stack the 10 blocks?

Jim  is designing stripes with five parallel colors on a piece of cloth. How many stripes can jim generate with the colors red, green, blue, yellow, and orange while having two or more consecutive reds?

Suppose that Karen, Sue, and Peter all work 6 hours a day. In an hour, Karen can make one widget or 2 thingamajigs. In an hour, Sue can make one widget or one thingamajig. In an hour, Peter can make 2 widgets or one thingamajig. If they all split their time evenly between making widgets and thingamajigs, how many thingamajigs can they make?

Jerri has 210 stamps in her collection. She wants to arrange her stamps in a rectangular array so there are the same number of stamps in each row without any left over. What are all the different ways she can arrange her stamps, not worrying about order?

Suppose you have 13 juniors and 11 seniors. How many different draws of 6 names would contain exactly 3 juniors and 3 seniors? a 94,600 b 45,400 286 d. 47,190

Find the value of​ n(A∪​B) if n(A)=3​, n(B)=8 and​ n(A∩B)=2. help please

Jen collects toy sports cars. She has 800800 yellowyellow cars and 320320 blackblack cars. She wants to line up the cars in groups so that each group has the same number of cars and contains only yellowyellow cars or only blackblack cars. What is the largest number of cars that she can have in a​ group?

What is the product of 19 and the sum of 13 and k?

if we place 1 penny on the first square of a chessboard, 3 pennies on the second, 9 pennies on the third and continue the pattern, how many pennies will be on the 120th square?