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19 April, 11:38

Penn stacks all his snowballs in a square pyramid. the number of snowball, P (n) in n layers of the square pyramid is given by P (n) = P (n-1) + n2

which could not be the number of snowballs Penn has?

A: 5

B: 30

C: 25

D: 14

+3
Answers (2)
  1. 19 April, 12:55
    0
    C: 25

    Step-by-step explanation:

    P (n) = P (n-1) + n²

    P₁ = P₀ + 1² = 0 + 1 = 1

    P₂ = P₁ + 2² = 1 + 4 = 5 (Option A)

    P₃ = P₂ + 3² = 5 + 9 = 14 (Option D)

    P₄ = P₃ + 4² = 14 + 16 = 30 (Option B)

    The number of snowballs cannot be 25.
  2. 19 April, 14:47
    0
    Right answer is C-25

    P (1) = 1

    P (2) = P (2-1) + 2^2=1+4=5

    P (3) = P (3-1) + 3^2=5+9=14

    P (4) = P (4-1) + 4^2=14+16=30

    There isn't 25
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