Let a_1+a_2+a_3,…a_49 be in A.P. such that ∑_(k=0)^12▒〖a_(4k+1)=416〗 and a_9+a_43=66.

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Let a_1+a_2+a_3,…a_49 be in A.P. such that
∑_(k=0)^12▒〖a_(4k+1)=416〗 and
a_9+a_43=66. If a_1^2+a_2^2+⋯+a_17^2=140m,
(a) 68 (b) 34 (c) 33 (d) 66
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