Math, asked by virendrakumarthakur9, 10 months ago

Please answer with step by step
No fake answers please help me

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Answered by zainsd110
1

Answer:

This can be solve by sum of terms of formula .

 {s}^{n}  =  \frac{n}{2} {2a + (n - 1)d

Here,n=12

a=t1=1.2

d=1.1

Therefore,answer=87

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