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Q. Find the odd number in the series: 2, 13, 65, 271, 817, 1639, 1645
The given series is in the below pattern, ∴ First term = 2 Second term = ( First term × 6 ) + 1 = 13 Third term = ( Second term × 5 ) + 2 = 65 , 67 should be sixth term because ( 13 × 5 ) + 2 = 67 . So 65 is wrong. we get 67 as Third term. Similarly we can find the all terms Fourth term = ( Third term × 4 ) + 3 = 271 Fifth term = ( Fourth term × 3 ) + 2 = 817 Sixth term = 1639, Seventh term = 1645.
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