Question

hi need help.1st one class 10th​

Answer 1

Sum of first 10 terms is 245

Explanation:

Given A.P is 2, 7, 12..........

first term (a) = 2

common difference (d)= a₂ - a₁

                                     = 7 - 2

                                     = 5

Sum of 'n' terms is given as

    Sₙ = $\frac{n}{2} [ 2a + (n-1) d]$

where n =10

=> S₁₀ = $\frac{10}{2} [ 2*2+ (10-1)*5]$

=> S₁₀= 5[ 4+ 45]

=> S₁₀ = 5* 49

=> S₁₀ = 245

To know more about AP, visit :

Maths solution for arithmetic progression

https://brainly.in/question/15005470

Maths class 10 arithmetic progression

https://brainly.in/question/14319449

Answer 2

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Sum of first 10 term is 245