Question

2, 11, 32, --- ?

• A. 71
• B. 41
• C. 35
• D. 46

Answer 1

Answer:

A. 71

n³+ 2n -1 എന്ന ശ്രേണീ രൂപത്തിൽ substitute ചെയ്യാവുന്നതാണ്.

n = 1

n³+ 2n -1 = 1³+ 2x1 -1

= 1 + 2 - 1

= 2

n = 2

n³+ 2n -1 = 2³+ 2 x 2 -1

= 8 + 4 -1

= 11

n = 3

n³+ 2n -1 = 3³+ 2x3 -1

= 27 + 6 - 1

= 32

n = 4

n³+ 2n -1 = 4³+ 2 x 4 -1

= 64 + 7

= 71