0 votes 0 votes 1, 9, 25, 49, ?, 121. What will come at the place of question mark ? A.100 B. 91 C. 64 D.81 Quantitative Aptitude sequences&series + – go_editor asked Jan 31, 2017 go_editor 13.9k points 651 views answer comment Share See all 0 reply Please log in or register to add a comment.
0 votes 0 votes $ 1 + (4 \times 2) = 9 $ $ 9 + (4 \times 4) = 25 $ $ 25 + (4 \times 6) = 49 $ $ \mathbf{49 + (4 \times 8) = 81} $ $ 81 + (4 \times 10) = 121 $ Lokesh . answered Feb 1, 2017 Lokesh . 842 points comment Share See all 0 reply Please log in or register to add a comment.
0 votes 0 votes Given series is a square of odd numbers; $1^2=1$ $3^2=9$ $5^2=25$ $7^2=49$ $9^2=81$ $11^2=121$ So option (D) is correct. Hira Thakur answered Apr 20, 2023 Hira Thakur 7.2k points comment Share See all 0 reply Please log in or register to add a comment.