MCA Entrance Previous Year Question Bank

The number of 3 digit numbers, that are divisible by either 3 or 4 but not divisible by 48, is:

Let $a_1,a_2,a_3,\dots$ be a GP of increasing positive numbers. If the product of fourth and sixth terms is $9$ and the sum of fifth and seventh terms is $24$, then $a_1{a}_9+a_2{a}_4{a}_9+a_5+a_7$ is equal to

The sum of the first 20 terms of the series 5 + 11+ 19 + 29 + 41 + ….. is :

If each term of a geometric progression $a_1,a_2,a_3,\dots$ with $a_1=\frac{1}{8}$ and $a_2\ne a_1$, is the arithmetic mean of the next two terms and $S_n=a_1+a_2+\dots +a_n$, then $S_{20}-S_{18}$ equals to