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A team of four is chosen from six married couples. If a husband and wife cannot both be on the team, in how many ways can the team be formed?

There are 12 choices for the first memebr, then 10 for the next (as it cannot be the spouse), then 8, then 6.Therefore there are 12 10 8 6 permutations where partners aren't together.However, this counts eve...
LC
Answered by Lily C. • Maths tutor
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How to answer elasticity questions

Answering Elasticity questions: Using technique DEED as for all other questions D- define E- explain E- example D- diagram YED = % Change in demand divided by the % change in income 1. Identify wether the go...
AS
Answered by Amber S. • Economics tutor
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Why does phenol react more readily with bromine than benzene?

The oxygen on the OH (of the phenol) has a lone pair which it donates into the delocalised pi system of the ringThis activates the ring and there is now a high electron density.This is now strong enough to p...
LK
Answered by Leah K. • Chemistry tutor
3953 Views

Where does the formula for gravitational potential come from? Why the minus sign?

We know Newton's Law of Gravitation , which states that the force F between two bodies of masses M and m respectively, separated by distance R, can be given by: F = GMm/R 2 where G is the gravitational const...
KM
Answered by Kieren M. • Physics tutor
9557 Views

Explain why a polymer may be more suitable for bottles than glass

Polymers such as PET have various properties such as being flexibility, lighweight and good strenght to weight ratio that allow them to be ergonomically used by consumers. Polymers are also able to be pigmen...
AL
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