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Q.12 The sum of n terms of the series
4 +44 +444 + ... is
(a) (4/81) [10n+1-9n-1]
(b) (4/81) [10n-1-9n-1]
(c) (4/81) [10n+1-9n-10]
(d) (4/81) [10-9n-10]
Q.13 What will be the maximum sum of
44, 42, 40, .....
(a) 502
(c) 506
(b) 504
(d) 500
Q.14 In a sequence of 12 consecutive odd numbers
the sum of the first 5 numbers is 425. Wha
is the sum of the last 5 numbers in th
sequence?
Try Yourself
T1. Find the sum of the expression
1
1
1
√1+√2+ √2+√3+√3+√4
*****
1
√80+√8

Hindi

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