Observe the following sums. Then find the sum of $1 + 3 + 5 + 7 + 9 - - - - + 19 ?$

121

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81

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100

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64

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Solution

The correct option is C $100$
From $1 t o 19$ there are $10$ odd numbers.
So $1 + 3 + 5 + 7 + - - - - + 19 = 10 \times 10 = 100$

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Similar questions

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

1 + 3 + 5 + 7 + 9

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

Without adding, find the sum of the following:

$i.1+3+5+7+9+11+13+15+17+19+21 =___$

Without adding find the sum

(i) 1 + 3 + 5 + 7 + 9

(ii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

(iii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

1 + 3 + 5 + 7 + 9

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

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