1
WB JEE 2011
MCQ (Single Correct Answer)
+1
-0.25

The number of diagonals in a polygon is 20. The number of sides of the polygon is

A
5
B
6
C
8
D
10
2
WB JEE 2011
MCQ (Single Correct Answer)
+1
-0.25

$${}^{15}{C_3} + {}^{15}{C_5} + \,\,......\,\, + {}^{15}{C_{15}} = $$

A
$${2^{14}}$$
B
$${2^{14}} - 15$$
C
$${2^{14}} + 15$$
D
$${2^{14}} - 1$$
3
WB JEE 2012
MCQ (Single Correct Answer)
+1
-0.33
A vehicle registration number consists of 2 letters of English alphabet followed by 4 digits, where the first digit is not zero. Then, the total number of vehicles with distinct registration numbers is
A
262 $$\times$$ 104
B
$${}^{26}{P_2}$$ $$\times$$ $${}^{10}{P_4}$$
C
$${}^{26}{P_2}$$ $$\times$$ 9 $${}^{10}{P_3}$$
D
262 $$\times$$ 9 $$\times$$ 103
4
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The numbers $$1,2,3, \ldots \ldots, \mathrm{m}$$ are arranged in random order. The number of ways this can be done, so that the numbers $$1,2, \ldots \ldots ., \mathrm{r}(\mathrm{r}<\mathrm{m})$$ appears as neighbours is

A
$$(m-r)$$ !
B
$$(\mathrm{m}-\mathrm{r}+1)$$ !
C
$$(\mathrm{m}-\mathrm{r})!\mathrm{r}$$ !
D
$$(\mathrm{m}-\mathrm{r}+1)!\mathrm{r}$$ !
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