11. The sum of the three consecutive numbers of an A.P. is 21 and the sum of their squares is 165. Find these terms.

1.   The sum of the three consecutive numbers of an A.P. is 21 and the sum of their squares is 165. Find these terms.

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Find the sum of : (i) All odd natural numbers smaller than 50. (ii) First 12 natural numbers that are multiples of 7.

 Find the sum of :

(i)              All odd natural numbers smaller than 50.

(ii)           First 12 natural numbers that are multiples of 7.