Statements: Some pearls are stones. Some stones are diamonds. No diamond is a gem.

Conclusions:

1. Some gems are pearls.
2. Some gems are diamonds.
3. No gem is a diamond.
4. No gem is a pearl.

This is a simple subtraction series. Each number is 6 less than the previous number.

The yarn, twine, and cord are all used for tying. The tape is not used in the same way.

Choices a, b, and c do not describe situations in which a product is guaranteed. Only choice d reflects a situation in which a seller attests to the quality of a product by giving the buyer a promise or assurance about its quality.

Because the letters are the same, concentrate on the number series, which is a simple 2, 3, 4, 5, 6 series, and follows each letter in order.

The advice is given to turn down the request for leave. So, I is implicit. The mention of the 'exigency of work' makes II implicit.

According to the statement, 80% of the total runs were made by spinners. So, I does not follow. Nothing about the opening batsmen is mentioned in the statement. So, II also does not follow.

The advertisement tells the different ways in which the drink can be had. This means that different people prefer to have it in a different way and that some people would prefer it only because it can be taken in a particular manner. So, both I and II are implicit.

Some trains are roads. No road is jungle.

Since one premise is particular and the other negative, the conclusion must be particular negative and should not contain the middle term. So, it follows that 'Some trains are not jungles'.

No road is jungle. All flowers are jungles.

Since both the premises are universal and one premise is negative, the conclusion must be universal negative and should not contain the middle term. So, it follows that 'No flower is road'. IV is the converse of this conclusion and so it holds.

Some trains are roads, No flower is road.

As discussed above, it follows that 'Some trains are not flowers'.

Slapstick results in laughter; horror results in fear.