Is `7 xx 5 xx 3 xx 2 + 3` a composite number? Justify your answer.

Explain why 7xx11 xx 13 + 13 and 7 xx 6xx 5 xx 4 xx 3 xx 2xx 1 +5 are composite numbers.

Let f be the subset of Z xx Z defined by f={(ab,a+b) : a,b in Z} . Is f a function from Z to Z? Justify your answer.

How will you show that (17xx11xx2)+(17xx11xx5) is a composite number? Explain.

If either vec(a)=vec(0) or vec(b)=vec(0) , then vec(a)xx vec(b)=vec(0) . Is the converse true ? Justify your answer with an example.

Is (i) log 2 rational or irrational? Justify your answer. (ii) log 100 rational or irrational? Justify your answer.

Do different species of plant a growing in the same area show the same rate of transpiration at a particular time ? Justify your answer.

Are the positions of (5,-8) and (-8,-5) is same? Justify your answer.

State whether each of the following statement is true or false. Justify your answer. { 2, 3, 4, 5 } and { 3, 6} are disjoint sets.

State whether each of the following statement is true or false. Justify your answer. { 2, 6, 10, 14 } and { 3, 7, 11, 15} are disjoint sets.