Sum of infinity of a \( G P \) is 15 and the sum of infinity
of their squares is 45 . If \( a \).... VIDEO
Sum of infinity of a \( G P \) is 15 and the sum of infinity
\( \mathrm{P} \)
of their squares is 45 . If \( a \) is the first term and \( r \) is the common ratio, then the sum of the first 5 terms of the \( A P \) with first term a and common difference \( 3 r \) is
(1) 25
(2) 35
(3) 45
(4) 55
.
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