Find out the missing number.
3, 5, 18, ? , 320


A) 64

B) 72

C) 84

D) 76

Correct Answer:
B) 72

Description for Correct answer:
\( \Large 3 \times 1+2 \times 1^{2}=3+2=5 \)

\( \Large 5 \times 2+2 \times 2^{2}=10+8=18 \)

\( \Large 18 \times 3+2 \times 3^{2}=54+18=72 \)

\( \Large 72 \times 4+2 \times 4^{2}=288+32=320 \)

Part of solved Number series questions and answers : >> Aptitude >> Number series








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