Show that `5xx7xx11+11` is a composite number .

Show that 5xx11xx17+17 is a composite number.

Explain why 3 xx 5 xx 7 +7 is a composite number.

C={x:x is a composite number and 5 le x le 21 }

Explain why 7xx11xx13+13 and 7xx6xx5xx4xx3xx2xx1+5 are composite numbers.

The sequence of odd natural numbers is divided into groups 1,3,5,7,9,11,"…." and so on. Show that the sum of the numbers in nth group is n^(3) .

Explain why 7*11*13+13a n d7*6*5*4*3*2*1+5 are composite numbers.

The sum of three times a number and 11 is 32. Find the number.

A pair of dice is tossed 10 times. What is the probability that no 7s or 11s appear as the sum of the sides facing up ?

Write the following statements in the form of equations:(i) The sum of three times x and 11 is 32.(ii) If you subtract 5 from 6 times a number, you get 7.(iii) One fourth of m is 3 more than 7.(iv) One third of a number plus 5 is 8.

If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are (a) 5, 10, 15, 20 (b) 4, 10, 16, 22 (c) 3, 7, 11, 15 (d) none of these