17, 21, 37, 73, 137, 237, ...

363

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369

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375

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381

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Solution

The correct option is D 381
Add to each term $2^{2}$ , $4^{2}$ , $6^{2}$ , $8^{2}$ , $10^{2}$ , $12^{2}$ etc The next term is 237 + 144 = 381

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Similar questions

Mental math

(i) (83 × 12) + (17 × 12)

(ii)

(iii) (3.7 × 19) + (6.3 × 19)

(iv) (137 × 13) − (37 × 13)

(v)

\frac{3^{21}}{3^{17}} + \frac{2^{73}}{2^{72}} =

log tan 17^{\circ} + log tan 37^{\circ} + log tan 53^{\circ} + log tan 73^{\circ}

log tan 17^{\circ} + log tan 37^{\circ} + log tan 53^{\circ} + log tan 73^{\circ}

Subtract -137 and 878 from -37

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