Question

if nth term of an AP is 4n+5,find sum up to first 10 terms​

Answer 1

Answer:

Step-by-step explanation:

nth term of an AP is 4n+5

for n=1 => 9

for n=2 =>13

for n=3 =>17

Hence common difference = 13-9 = 4

First term = 9

The Sum for First 10 terms = n/2(2a+(n-1)d))

                                            =10/2(18+36) = 5*54 = 270[Answer]

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