If a1-2- a2-3-a1 and an-2an-1-5 for n-1- the value of - r-2 5 a r is

The correct option is A 130 a_1=2 a_2=3+a_1=5 a_n=2a_n 1+5 ∴a_3= 2a_2+5 =15 a_4=2 ×a_3+5 =35 a_5=2 ×a_4+5 =75 ...

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nth Term of A.P

If a1=2, a2...

Question

If $a_{1} = 2, a_{2} = 3 + a_{1}$ and $a_{n} = 2 a_{n - 1} + 5$ for $n > 1$ , the value of $\sum_{r = 2}^{5} a_{r}$ is

130

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160

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190

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220

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S_{n} = a_{1} + a_{2} + a_{3} + \dots + a_{n},

a_{1} = 1

a_{n} = 2 a_{n - 1} + 1,

n \geq 2

S_{50}

a_{1} = 2, a_{2} = 3 + a_{1}

a_{n} = 2 a_{n - 1} + 5

n > 2

S_{n} = a_{1} + a_{2} + a_{3} + \dots + a_{n},

a_{1} = 1

a_{n} = 2 a_{n - 1} + 1,

n \geq 2

S_{50}

a_{1}, a_{2}, a_{3} \dots, a_{n}

a_{i} > 0

\frac{1}{\sqrt{a_{1}} + \sqrt{a_{2}}} + \frac{1}{\sqrt{a_{2}} + \sqrt{a_{3}}} + \dots + \frac{1}{\sqrt{a_{n - 2}} + \sqrt{a_{n}}}

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