The algebraic expression for sequence 1 + (1 + 5), 2 + (2 + 5), 3 + (3 + 5), ... is
n + (n + 5)
n + (1 + 5)
1 + (n + 5)
n + (n + 1)
Which of the following algebraic expressions explain the following
12 + 13 = 56