Find the number of terms if-
`3-6+12-24+`….=-1023.

Find the number of terms if- 1+2+4+ ….=32767

Find the number of terms if- 64+32+16+ ….= 127(1/2) .

Find the nth term of 6,8,10,….

The first term of an AP is 5,the last term is 45 and the sum is 400.Find the number of terms and the common difference.

If the last term is 994,the sum of the A.P series whose first term is a is 70,336.If the number of terms is 128. Find a.

Let A={1,2,3} . Find the number of relations containing (1,2) and (1,3) which are eflexive and symmetric but not transitive

The first term and the last term of an A.P. are 2 and 29, respectively. If the sum of the series is 155, find the number of terms and common difference.

In a class 18 students offered Physics, 23 offered Chemistry and 24 offered Mathematics. Of them, 13 offered both Chemistry and Mathematics, 12 offered both Physics and Chemistry, 11 offered both Mathematics and Physics and 6 offered all three. Find the number of students in the class.

Find the sum of first n terms of the following .6+.66+.666+…..