[1,2,6,15,31,56,91],[" A."31],[" C."56]

1, 2, 6, 15, 31, 56, 91 (a) 31 (b) 91 (c) 56 (d) 15

56, 91, 175, 417, 777

Arrange the following data as an array (descending order): (i) 2,0,3,4, 1, 2, 3,5 (ii) 9.1, 3.7, 5.6, 8.3, 11.5, 10.6

x^(2)-15x+56

If A=[(9,1),(4,3)],B=[(1,5),(6,11)] and 3A+5B+2X=0 then X =

If A={:[(1,7),(5,6)]:},B={:[(-3,2),(-1,5)]:}andC={:[(2,-3),(4,1)]:} , then find A(B+C) and AB+AC.

Find the missing term in the given series. 1, 2, 6,15, 31, ?