Question

On the occasion of Dipawali festival each sutdent of a class sends greeting cards to others. If there are 20 students in the class, the number of cards sends by students is
(A) \({ }^{20} \mathrm{C}_{2}\)
(B) \({ }^{20} P_{2}\)
(C) \(2 \times{ }^{20} \mathrm{C}_{2}\)
(D) \(2 \times{ }^{20} \mathrm{P}_{2}\)

Answer 1

Ans: (C, B)
Hint : \({ }^{20} \mathrm{C}_{2} \times 2\)

Answer 2

brand cialis 40mg <a href="https://ordergnonline.com/">tadalafil 5mg without prescription</a> medication for ed dysfunction

Answer 3

buy generic cialis <a href="https://ordergnonline.com/">real cialis pills</a> causes of ed

Answer 4

prednisone no rx: http://prednisone1st.store/# 100 mg prednisone daily