There are 10 true or false questions in an examination. Then these questions can be answered in ______.

(a)

240 ways 

(b)

120 ways 

(c)

1024 ways 

(d)

100 ways 

The total number of 9 digit number which have all different digit is ________.

(a)

10!

(b)

9!

(c)

9\(\times\)9!

(d)

10\(\times\)10!

Thirteen guests has participated in a dinner. The number of handshakes happened in the dinner is __________.

(a)

715

(b)

78

(c)

286

(d)

13

Sum of Binomial co-efficient in a particular expansion is 256, then number of terms in the expansion is ________.

(a)

8

(b)

7

(c)

6

(d)

9

Sum of the binomial coefficients is ________.

(a)

2ⁿ

(b)

n²

(c)

2n

(d)

n + 17